SEC Exam 2027: What Replaces O-Levels and N-Levels

The Singapore-Cambridge Secondary Education Certificate (SEC) examination will replace the O-Level, N(A)-Level, and N(T)-Level examinations from 2027 — the first cohort affected is students who entered Secondary 1 in 2024, and these students will receive a single national certificate listing all subjects at their respective G1, G2, or G3 levels. This is the most significant structural change to Singapore's secondary examination system in decades, yet the actual exam papers and content standards remain largely unchanged. This guide is by Ancourage Academy, whose tutors are tracking the SEC transition and adapting all secondary programmes accordingly.

At Ancourage Academy, parents frequently ask whether the SEC means their children need to prepare differently. The short answer: the exam format and difficulty at each level are the same as the current O-Level and N-Level papers. What changes is the certification structure, the JC admission aggregate, and the way results are reported — not the content or skills tested. This guide explains exactly what changes, what stays the same, and what parents should do to prepare.

What Is the SEC Examination

Ancourage Academy's secondary programmes prepare students for both current O-Levels and the upcoming SEC — book a trial class (usually $18) for a diagnostic assessment.

The SEC is a unified national examination that replaces three separate certifications (O-Level, N(A)-Level, N(T)-Level) with a single certificate — reflecting Singapore's shift from streaming to Full Subject-Based Banding (Full SBB) where students take subjects at different levels based on ability.

"In 2027, the Singapore-Cambridge General Certificate Education (GCE) for the N(T), N(A) and Ordinary Levels will be combined and renamed as the Singapore-Cambridge Secondary Education Certificate (SEC) in line with the implementation of Full Subject-Based Banding (FSBB)."

— Singapore Examinations and Assessment Board, Secondary Education Certificate (SEC)

Under the old system:

• Express stream: Sat for O-Levels after 4 years
• Normal Academic (NA): Sat for N(A)-Levels after 4 years, then O-Levels after 5 years
• Normal Technical (NT): Sat for N(T)-Levels after 4 years

Under the SEC system:

• All students sit for the SEC examination
• Each subject is taken at G1, G2, or G3 level based on the student's ability in that subject
• One certificate lists all subjects with their respective levels and grades
• No stream labels appear on the certificate — only subject levels

The key principle: a student strong in Mathematics but weaker in English might take G3 Maths and G2 English, rather than being locked into one stream for all subjects. The SEC certificate reflects this flexibility. Details are available on the MOE Full SBB page.

Timeline: When the Changes Take Effect

The SEC rollout follows a clear timeline tied to cohort progression — the 2024 Secondary 1 cohort is the first to sit for the SEC, with JC and polytechnic admission changes cascading from 2028. For the 2026 exam-results release dates under the current O-Level / SEC transition, see our Singapore national-exam results dates.

Students currently in Secondary 4 (as of 2026) — the last cohort who entered Sec 1 in 2023 — will still sit for O-Levels or N-Levels under the existing system. Students currently in Secondary 3 (the 2024 Sec 1 cohort) and Secondary 2 (the 2025 Sec 1 cohort) are already on the SEC track and will sit for the SEC in 2027 and 2028 respectively. Parents of current Primary 5-6 students should understand the SEC framework, as their children will be among the early SEC cohorts.

O-Level to SEC G3 Subject Code Reference

From 2027, every main GCE O-Level subject carries forward at the same standard under a new Singapore-Cambridge SEC G3 code — for most subjects the difficulty and syllabus are unchanged and the main change is the code itself. For example, O-Level English 1184 becomes SEC G3 K300, and O-Level E-Maths 4052 becomes K310. This table maps each main O-Level / SEC G3 subject code so families can cross-reference syllabus documents during the transition. A few subjects carry revised or refined 2027 syllabuses, so always confirm the specific subject on SEAB.

Because G3 papers follow the existing O-Level standard, the code change does not affect difficulty or preparation. The full official code list is published on the SEAB SEC G3 syllabus page, alongside the corresponding 2026 GCE O-Level syllabuses.

How G1, G2, and G3 Levels Replace Streams

Under Full SBB, the three streams (Express, N(A), N(T)) are replaced by three subject levels — G3 (most demanding), G2 (intermediate), and G1 (foundational) — and students can take different subjects at different levels.

• G3: Equivalent to the current O-Level standard. Papers are the same difficulty as existing O-Level exams. Graded A1–D7, E8, F9 (same as O-Level grading; certificate awarded at E8 or better). This is the level needed for JC admission
• G2: Equivalent to the current N(A)-Level standard. Graded 1–6, with Grade 1 the highest (certificate awarded at Grade 5 or better; Grade 6 does not earn the certificate) — this extends the former N(A)-Level 1-to-5 numeric scale to a sixth grade. Students can take some subjects at G3 if they demonstrate ability
• G1: Equivalent to the current N(T)-Level standard. Graded A–E (same as N(T) grading; certificate awarded at Grade D or better). Focused on practical application and foundational skills

A student might take G3 Mathematics, G3 Science, G2 English, and G2 Humanities — all reflected on one SEC certificate. This replaces the old system where a student's entire programme was determined by their stream. The flexibility means more students can access G3 (O-Level standard) papers in their stronger subjects.

What Changes in Subject Combinations

Full SBB gives students greater flexibility in subject combinations across G-levels, but this also means families must plan more carefully — not all G-level combinations lead to the same post-secondary options.

Key changes:

• Mixed-level combinations: Students can take G3 E-Maths and G2 English, or G3 English and G2 Science. The SEC certificate shows the level for each subject
• Mother Tongue Languages: Under Full SBB, the Sec 5 year — previously available to N(A) students who wanted to retake MTL at O-Level standard — is no longer part of the standard pathway. Students should begin focused MTL preparation early to ensure they are well-prepared when the examination comes
• Science options: Combined Science and Pure Sciences continue at G3 level. G2 Science covers the N(A) syllabus content. The choice between Combined and Pure remains important for JC pathways
• Humanities: Combined Humanities remains compulsory. Pure Humanities subjects (History, Geography, Literature) are available at G3 level. Under Full SBB, more students can access G3 Humanities if they show aptitude

Schools will continue to guide subject selection, but parents should understand that the number of G3 subjects a student takes directly determines their post-secondary eligibility. A student with all G2 subjects will not qualify for JC even with excellent grades — the JC pathway requires G3 subjects. For how to choose subjects across G-levels, see our Sec 3 subject combination guide.

How JC Admission Changes From 2028

The current L1R5 aggregate for JC admission will be replaced for the 2028 Post-Secondary Admissions Exercise (PSE) — the first unified admissions exercise using SEC results — by a new L1R4 aggregate announced by MOE.

What is confirmed:

• G3 subjects only: Only G3 (O-Level equivalent) grades will count towards the L1R4 aggregate for JC admission. G2 and G1 grades do not count in the aggregate, though G2 or G1 Mother Tongue can still satisfy the minimum MTL requirement
• Revised aggregate: For the first SEC cohort, JC admission uses L1R4 (1 language + 4 relevant subjects) with a qualifying aggregate of 16 or below
• Cut-Off Points (COP): Individual JC COPs will be recalibrated to reflect the new aggregate. A lower COP does not mean easier admission — it reflects fewer subjects in the calculation
• Minimum requirements: Students will still need passes in English and a minimum number of G3 subjects to qualify for JC

For the current system, JC admission requires L1R5 ≤ 20 (aggregate of English + 5 relevant subjects). For the first SEC-based PSE in 2028, the qualifying criterion becomes L1R4 ≤ 16 — see our L1R4 JC admission (2028 PSE) guide for the full breakdown, or work out your own aggregate with our L1R5 / L1R4 JC admission calculator. The academic rigour expected of JC entrants is not changing — only the calculation method.

How the SEC Affects Polytechnic and ITE Admission

Polytechnic and ITE admission criteria will also be updated to accommodate SEC results — polytechnics will continue to use an aggregate score (currently ELR2B2), while ITE will accept G1 and G2 grades that previously required separate N-Level certificates.

• Polytechnic admission: The ELR2B2 aggregate (English, 2 Relevant subjects, 2 Best subjects) — which you can compute with our ELR2B2 calculator — will be adapted for SEC results. G3 grades convert directly (same as current O-Level). G2 grades will have a defined conversion for polytechnic entry, expanding access for students who take a mix of G2 and G3 subjects
• ITE admission: Currently requires N-Level results. Under the SEC, ITE will accept G1 and G2 grades directly from the SEC certificate. This simplifies the pathway — students no longer need a separate "N-Level certificate" for ITE applications
• Unified Post-Secondary Admissions Exercise (PSE): From 2028, a single PSE replaces the separate JAE, PFPAE, and JIE exercises. Students use their SEC results to apply for JC, MI, polytechnics, and ITE courses through one common portal. The DPP (Direct-Entry Scheme to Polytechnic Programme), previously a separate route for N(A) students to enter polytechnic via ITE, ceases as a named programme under Full SBB — students now apply for Higher Nitec courses directly through the PSE. See our guide to N-Level pathways (PFP, Sec 5, DPP, ITE) for how these routes change
• Polytechnic Foundation Programme (PFP): Continues under the PSE for students with strong G2 grades. Eligibility uses an ELMAB3 aggregate computed on G2 equivalent grades, with G3 grades mapped to G2 equivalents where applicable

What Does Not Change Under the SEC

Despite the significant structural changes, the actual examination experience — paper format, content standards, marking criteria, and difficulty level — remains unchanged at each respective level.

• Exam papers: G3 papers are pegged to the current O-Level standard. G2 papers match current N(A) papers. G1 papers match current N(T) papers. The content standards and marking criteria remain the same
• Syllabus content: Most syllabuses are broadly aligned with their O-Level predecessors in content and standards, though SEAB has published SEC-specific syllabus documents and some subjects carry revised or refined syllabuses. O-Level preparation strategies still apply directly to G3 SEC preparation. From 2027, subjects carry new SEC codes (e.g., K300 for English, K310 for E-Maths) while the previous O-Level codes (1184, 4052) are retained for cross-reference
• Practical examinations: Science practical papers, oral examinations, and listening comprehension tests continue in the same format
• Assessment components: Subject paper structures remain subject-specific (for example, English Language — K300, formerly 1184 — remains four national papers)
• Grading scales: G3 uses A1–D7, E8, F9 (same as O-Level). G2 uses Grades 1–6 — carrying forward the N(A)-Level numeric style but adding a sixth, non-certificating grade to the former 1-to-5 scale (certificate awarded at Grade 5 or better). G1 uses A–E (same as N(T)). The grading style is carried over from the existing exams rather than reinvented

For most core subjects — particularly Mathematics, Additional Mathematics, and Pure Sciences — existing preparation resources and past-year papers remain directly relevant. However, students should check the official SEC syllabus documents on SEAB's website for their specific subjects, as some carry revised content. Students should also note that MTL no longer has a mid-year retake opportunity, and English/MTL written papers have moved to September. Proven study strategies continue to apply to G3 SEC preparation.

How Parents and Students Should Prepare

The most important preparation is not for the exam itself (which is unchanged) but for understanding how G-level choices and SEC results map to post-secondary pathways — decisions made in Secondary 2-3 have lasting consequences.

• Understand G-level implications: Ensure your child takes G3 in subjects needed for their intended pathway. If JC is a possibility, the student needs at least 5 G3 subjects (1 language + 4 relevant subjects under L1R4). If polytechnic is the goal, a mix of G2 and G3 may suffice
• Plan MTL carefully: Under Full SBB, the Sec 5 year is no longer part of the standard pathway. Students who struggle with Mother Tongue should begin focused preparation early rather than relying on a retake opportunity
• Maintain exam technique: Since G3 papers are pegged to the same standard as O-Level papers, proven exam preparation strategies remain essential. Do not be distracted by the structural changes — the skills examiners reward are unchanged
• Stay informed: MOE has published the 2028 PSE framework, including L1R4 criteria for JC admission. Specific school cut-off points will be updated as the first SEC cohort approaches

At Ancourage Academy, our secondary programmes prepare students for G3 examinations using the same rigorous approach we apply to O-Level preparation. Whether your child sits the last O-Levels in 2026 or the first SEC in 2027, the teaching, content, and exam techniques are identical. Book a trial class (usually $18) if you want an honest assessment of your child's readiness, or WhatsApp us with any questions.

Common Questions About the SEC Exam

When is the first SEC examination?

The first SEC examination will be held in 2027. It applies to students who entered Secondary 1 in 2024 (who are in Sec 3 as of 2026). Only students currently in Sec 4 (as of 2026) will take the last O-Levels or N-Levels — students in Sec 2 and 3 are already on the SEC track.

Is the SEC harder than the O-Level?

No. G3 SEC papers are the same standard as current O-Level papers. The difficulty, format, and marking criteria are unchanged. The SEC is a structural change to how results are reported and used for admission, not a change to the examination itself.

Can my child still go to JC under the SEC?

Yes. Students with sufficient G3 subjects and grades that meet the revised JC criteria (L1R4 ≤ 16) can apply to JC through the 2028 PSE. The pathway remains the same — strong academic performance at the G3 level qualifies students for JC.

What happens to the N-Level certificate?

The N(A)-Level and N(T)-Level certificates will be discontinued. Under the SEC, G2 and G1 grades appear on the same SEC certificate alongside G3 grades. Students no longer receive separate certificates for different levels.

Do existing O-Level past papers still help for SEC preparation?

For most core subjects, yes. G3 papers are identical in standard to O-Level papers, and O-Level past-year papers, ten-year series, and prelim papers remain excellent preparation resources — particularly for Mathematics and Sciences. However, students should check their specific subject's SEC syllabus on SEAB's website, as some subjects have revised content. Similarly, N(A) past papers remain relevant for G2 preparation. For a full strategy when official SEC past papers are not yet available, see our SEC 2027 preparation guide.

How does the SEC affect subject combination choices?

Full SBB allows more flexible subject combinations across G-levels. A student can take G3 Mathematics and G2 English on the same certificate. However, JC-bound students should aim for G3 in most subjects. The subject combination choice in Sec 3 remains the key decision point.

Related: How Full SBB works · G2 vs G3 Subject Levels · Getting ready for O-Levels · SEC 2027: What Changes for Maths · G1, G2, G3 Mathematics Under Full SBB · Woodlands Secondary Schools