Singapore GCE N(A)-Level Combined Science: complete 2026 guide to the Physics, Chemistry and Biology content and the two papers

Singapore GCE N(A)-Level Combined Science is a Normal (Academic) track subject that brings two of the three sciences (Physics, Chemistry and Biology) together into a single certificate. It builds the core scientific knowledge and practical skills that let many students go on to sit the O-Level examination the following year, so it is designed as a supportive stepping stone with clear scaffolding.

This page is the index. Below you will find the three-strand content breakdown, the two-paper written structure, how the practical-skills component works, a study strategy, and links to every dot-point answer page we have shipped for N(A) Combined Science in 2026.

The three science strands

Physics

Physical quantities and measurement, speed and acceleration and motion graphs, forces and Newton's laws, work and energy and power, light and the electromagnetic spectrum, sound and waves, current electricity and simple circuits, and magnetism and electromagnetism. The physics strand rewards careful unit work and confident rearranging of a small set of relationships.

Chemistry

Atomic structure and the periodic table, chemical bonding, the mole and chemical formulae, states of matter and separation techniques, acids and bases and the pH scale, salt preparation, energy changes in reactions, the reactivity series and extraction of metals, the atmosphere and air pollution, and simple organic chemistry (fuels and alkanes). Chemistry usually appears in both Combined Science pairings.

Biology

Cell structure and organisation, movement of substances across membranes, the human digestive system, transport and the circulatory system, photosynthesis and leaf structure, nutrients and a balanced diet, enzymes, cell division and inheritance, ecosystems and food chains, and the effect of humans on the environment. The biology strand rewards precise definitions and clear diagrams.

Exam structure

N(A) Combined Science is assessed through written papers and a practical-skills component. The exact paper numbers, durations and mark allocations depend on the science pairing your school offers, so always confirm them against the current SEAB syllabus. The typical shape is:

• A multiple-choice paper. Objective questions spread across both science strands, testing recall and quick application. Every mark is worth the same, so pace yourself and never leave a blank.
• A structured and free-response paper. Shorter structured questions that build from one part to the next, plus a small number of longer free-response questions. This is where method marks and clear definitions earn most of the grade.
• A practical-skills component. An assessment of safe laboratory technique, accurate measurement and recording, observation, and drawing conclusions from results.

Across the papers you will meet calculation questions (speed, energy, the mole), explanation questions (why a reaction happens, how a system works), recall questions (definitions, the reactivity series, food tests), and data questions (reading graphs, tables and instruments).

The data and formulae sheet

Each written paper is sat with a small data and formulae sheet. It typically lists common relative atomic masses, useful physical constants, and the standard relationships you will need. Learn to find each value quickly so you spend your time thinking, not searching. You should never waste memory on constants you are given, only on how to use them.

Syllabus, dot point by dot point

For statement-level coverage, every learning outcome we have shipped has its own focused answer page with worked exam-style questions and cross-links to related points.

Browse the full set at /sg-n-level/combined-science/syllabus.

Study strategy

N(A) Combined Science rewards steady, layered study across all three strands. The recipe:

1. Lock down the core definitions. Speed, acceleration, force, energy, the mole, the cell, an enzyme, a food chain. Examiners give easy marks for precise definitions, so write them out from memory each week.
2. Drill the small set of calculations. Speed and acceleration, work and energy, simple mole sums. Each follows a fixed pattern, so practise until rearranging the formula is automatic.
3. Learn the tests cold. The chemical tests for common gases and ions, and the food tests for starch, glucose, protein and fat, recur every year and in the practical component.
4. Practise reading instruments. Rulers, measuring cylinders, thermometers and ammeters all appear in data and practical questions. Read to the correct precision and always include units.
5. Sit timed past papers from mid-year. Attempt several complete papers under exam conditions so you learn to pace the multiple-choice paper and budget time on the structured questions.

For the official syllabus

SEAB publishes the full Combined Science syllabus documents and specimen papers at seab.gov.sg. Always confirm your exact subject code, the science pairing, the paper structure and the assessment weightings against the current syllabus year, as SEAB reviews syllabuses periodically.