Science Learning Hub | Primary, PSLE, Secondary and Advanced Science | eduKateSG

The Science Journey: One World, Increasing Resolution

A child does not leave one universe after PSLE and enter another called Biology, Chemistry and Physics. The world was always connected. School changes the resolution, representation and assessment demands.

Primary 1–2: Science Foundations Before Formal Primary Science

Formal MOE Primary Science begins at Primary 3. Before that, observation, comparison, classification, measurement, evidence language, prediction and simple investigation can be built deliberately without pretending P1/P2 already have the formal Science syllabus.

Use Primary 1 Science Foundations and Primary 2 Science Foundations.

Primary 3–4: Formal Science Begins, Then Systems and Matter Grow

Primary 3 establishes Diversity, materials, life cycles and magnets inside formal Science. Primary 4 increases system reasoning through plant and digestive systems, matter, light and heat.

Use How Primary 3 Science Works and How Primary 4 Science Works.

Primary 5–6: Integration Before PSLE

Primary 5 connects reproduction, water, living systems and electricity. Primary 6 adds photosynthesis, forces, environmental interactions and, for Standard Science, the relevant higher-resolution energy and force content. The real examination preparation is cumulative P3–P6 retrieval and transfer.

Use How Primary 5 Science Works and How Primary 6 Science Works.

PSLE: Standard and Foundation Are Separate Routes

PSLE Science preparation must now distinguish the actual subject route. Standard Science 0009 and Foundation Science 0039 have different syllabus requirements and revised 2026 paper architectures.

Use PSLE Standard Science 0009 and PSLE Foundation Science 0039.

Secondary 1–2: Models, Laboratory Thinking and Lower-Secondary Integration

Lower Secondary Science makes models, variables, measurements, graphs, particles, cells, interactions and systems more explicit. Schools may sequence the two-year syllabus differently, so the durable job is to keep the scientific backbeats stable while following the student’s actual school order.

Use Secondary 1 Science and Secondary 2 Science.

Secondary 3–4: Upper-Secondary Specialisation and Examination Stability

Secondary 3 increases resolution as students enter upper-secondary Science combinations or pure disciplines. For the 2026 Sec 3 cohort, the route leads into the first SEC examinations in 2027. Secondary 4 in 2026 still finishes under the current GCE framework, so cohort boundaries must stay explicit.

Use Secondary 3 Science and Secondary 4 Science.

SEC from 2027: G1, G2 and G3 Are Different Science Operating Envelopes

G1 K123 is integrated and includes an e-Examination. G2 K223–K225 uses two combined disciplines with separate MCQ and structured components. G3 K326–K328 combines two disciplines with a common practical, while K323–K325 are pure Physics, Chemistry and Biology routes.

Use SEC Science Pathways, then route into G1 Science, G2 Science or G3 Science.

Chemistry: A Dedicated Discipline Route

Chemistry needs its own macroscopic, particle, symbolic, quantitative and practical translation system. The current Phase 4 route spans Secondary 3, Secondary 4, G2 combined Science Chemistry, G3 combined/pure Chemistry and the 2026 O-Level → 2027 SEC transition.

Use Secondary 3 Chemistry, Secondary 4 Chemistry, SEC G2 Chemistry Science, SEC G3 Chemistry and the O-Level Chemistry → SEC G3 transition guide.

JC and Beyond: Models Acquire Explicit Limits

Advanced science increasingly asks learners to manage assumptions, approximation, uncertainty, measurement quality, competing models and the conditions under which an explanation is valid. Chemistry continues through H1 Chemistry, H2 Chemistry and H3 Chemistry.