SEC G1, G2 and G3 Science in Singapore: 2027 Subject Levels and K-Codes
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Guide to SEC Science in Singapore from 2027, covering G1, G2, and G3 subject levels, official SEAB K-codes, and how 2026 O-Level and N-Level science pages still fit.
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- Start Here
- What SEC G1 G2 And G3 Science Means
- SEC Science K-Codes At A Glance
- G3 Science: Physics K323, Chemistry K324, Biology K325
SEC Science is the science subject-level language families will see from the 2027 Singapore-Cambridge Secondary Education Certificate. SEAB lists Science subjects under G1, G2, and G3 levels, with new 2027 K-codes beside the older subject codes used for reference.
Use this page to understand the Science K-codes. If you are sitting the 2026 O-Level or N-Level examinations, keep using the current 2026 syllabuses, calendars, and subject-code pages.
Start Here
| If you have... | Read this first | What to do next |
| 1 second | SEC Science uses G1, G2, and G3 subject levels from 2027. | Check the official SEAB syllabus page for the exact subject and K-code. |
| 10 seconds | G3 includes Physics K323, Chemistry K324, Biology K325, and the G3 Combined Science combinations K326, K327, and K328. | If you are preparing for 2026, keep using the current O-Level 6091, 6092, 6093, 5086, 5087, and 5088 pages. |
| 100 seconds | The K-codes help families read the 2027 SEC syllabus list, but they do not mean every 2026 revision page should be renamed immediately. | Use this guide for mapping, then route to the relevant Eclat practical, tuition, date, or SEC transition page. |
What SEC G1 G2 And G3 Science Means
SEAB says that from 2027, the current GCE N(T), N(A), and O-Level examinations will be combined and renamed as the Singapore-Cambridge Secondary Education Certificate (SEC). Under SEC, students sit subjects at G1, G2, or G3 subject levels and receive one certificate showing the subjects and levels taken.
MOE gives the wider Full Subject-Based Banding context. Starting from the 2024 Secondary 1 cohort, the Normal (Technical), Normal (Academic), and Express streams are removed, with students posted through Posting Groups 1, 2, and 3 and able to offer subjects at different subject levels as they progress.
