Every O-Level topic explained clearly — definitions, worked examples, exam traps, and full mock papers. No sign-up. Completely free.
Pure Sciences 6091 · 6092 · 6093 · Combined Science 5086 / 5087 / 5088 · Lower Secondary
Each subject has notes for every syllabus topic, flashcards, quizzes, and 3 full mock papers.
Full 40-MCQ simulations. Start the timer, answer all 40, submit — get your A1–U grade estimate instantly with a full explanation for every question.
These practise the exact skills O-Level papers test — graphs, diagrams, experiments and data analysis.
Notes, flashcards, and PYQ-style practice for lower secondary science — builds the foundation for O-Level.
O-Level Science in Singapore covers three distinct pathways. Pure Biology (6093), Pure Chemistry (6092) and Pure Physics (6091) each have their own full syllabus, assessed across Paper 1 (MCQ), Paper 2 (structured questions) and Paper 3 (practical). Combined Science — offered as Biology–Chemistry (5086/5088) or Physics–Chemistry (5105/5131) — covers selected content from two disciplines in a single subject, and is taken by the majority of students in the Express and Normal Academic streams.
Every topic page on ScienceStar covers the full SEAB syllabus for that topic, not a summary. Each page includes definitions written to match mark-scheme wording, worked examples using the exact same step-by-step format that earns marks in Paper 2, common mistakes (the specific errors that examiners flag most frequently), and an 8-question quiz with instant feedback and a score tracker. The quiz questions are written in the same style as actual O-Level structured questions — not simple recall, but the kind of reasoning questions that appear in Papers 1 and 2.
The mock papers (Paper 1 format, 30 MCQ, 1-hour timer) give students practice with the real exam format — not just individual questions in isolation. Taking a full mock paper under timed conditions, then working through the explanations for every wrong answer, is one of the highest-value study activities a student can do in the weeks before the O-Level exam. The revision checklists let students track their coverage of the syllabus systematically, so nothing is left unrevised.
Is Combined Science enough to get into a good polytechnic course?
Yes — most polytechnic courses accept Combined Science, including allied health, engineering, IT, business and hospitality programmes. A small number of courses (such as certain engineering diplomas or pre-university science tracks) specify that applicants must have at least one Pure Science. Check your target course's specific requirements on the polytechnic website.
Do I need all three Pure Sciences to go to JC?
No. You do not need to take all three Pure Sciences at O-Level. However, to take certain JC H2 Science combinations (such as H2 Biology + H2 Chemistry, or H2 Physics + H2 Chemistry), most JCs require that you have the corresponding Pure Science at O-Level. Many JCs also consider Combined Science as meeting the science prerequisite for H1 Science combinations. Check individual JC cut-off points and prerequisite policies for your intended H2 combination.
How many topics are there per subject?
The SEAB syllabus for each Pure Science has approximately 10–12 main content areas. ScienceStar currently covers 10 topic pages per subject for Pure Biology, Chemistry and Physics, plus the 5 Combined Science guides (hub, Bio–Chem, Phy–Chem, Structured Questions, and Practical Skills), plus 3 mock papers per subject.