IGCSE Sciences: Separate, Co-ordinated or Combined?
Cambridge offers three ways to study science at IGCSE: the three separate sciences (Biology 0610, Chemistry 0620 and Physics 0625), Co-ordinated Sciences 0654, which leads to a double award, and Combined Science 0653, which leads to a single award. The short answer for most families: separate sciences give the most depth and three certificates, Co-ordinated Sciences gives broad coverage of all three subjects worth two grades, and Combined Science gives a lighter course worth one grade. Which one your child takes is usually set, or at least limited, by the school, so the useful question is what each route means for study, exams and the next step after Grade 10.
This guide compares the three Cambridge routes using Cambridge International's own syllabus documents, explains how the papers and tiers work, looks at which route suits a student heading to the IB Diploma, A Levels or CBSE/ISC Class 11, and sets out what changes when you look for a tutor in Gurgaon (Gurugram). If you are weighing Cambridge against Pearson Edexcel instead, our Cambridge vs Edexcel IGCSE guide covers that board-to-board comparison.
The three Cambridge routes and what each certifies
| Route | Syllabus code(s) | What the student receives | Content (as numbered in the syllabus) | Exam series |
|---|---|---|---|---|
| Separate sciences | Biology 0610, Chemistry 0620, Physics 0625 | Three separate IGCSE grades | Biology 21 topics, Chemistry 12 topics, Physics 6 topics, each in its own syllabus | June and November, plus a March series in India |
| Co-ordinated Sciences (Double Award) | 0654 | One double grade on a scale from A*A* to GG | Biology B1–B19, Chemistry C1–C12, Physics P1–P6 | June and November, plus a March series in India |
| Combined Science | 0653 | One single grade | Biology B1–B16, Chemistry C1–C12, Physics P1–P5 | June and November, plus a March series in India |
Syllabus years matter. The separate sciences currently run on 2026–2028 syllabuses, and Cambridge published 2029 versions in September 2026 with no significant changes that affect teaching. Combined Science 0653 and Co-ordinated Sciences 0654 run on 2025–2027 syllabuses, and Cambridge has already published 2028–2029 syllabuses for both. Always check that your child's notes and past papers match the syllabus year of their exam.
A note on reading the table: topic counts are a way to see coverage, not depth. Fewer numbered topics in Combined Science means less ground; it does not tell you how deep each topic goes. The detailed content statements in each syllabus are the real comparison, and a tutor should work from those, not from a summary like this one.
The three subjects in the separate route
- Physics 0625: Motion, forces and energy; Thermal physics; Waves; Electricity and magnetism; Nuclear physics; Space physics.
- Chemistry 0620: States of matter; Atoms, elements and compounds; Stoichiometry; Electrochemistry; Chemical energetics; Chemical reactions; Acids, bases and salts; The Periodic Table; Metals; Chemistry of the environment; Organic chemistry; Experimental techniques and chemical analysis.
- Biology 0610: twenty-one topics running from Characteristics and classification of living organisms through Enzymes, Transport, Respiration, Coordination and response, Inheritance and Variation to Biotechnology and genetic modification.
How the papers and tiers compare
All three routes use Core and Extended tiers. Core is the more accessible tier; in the separate sciences, only Extended candidates can earn grades above C.
For each separate science (2026–2028), every candidate takes three papers:
- Core: Paper 1 (40 four-option multiple-choice questions, 30%) and Paper 3 (theory, 80 marks, 50%). Core candidates can earn grades C–G.
- Extended: Paper 2 (multiple choice) and Paper 4 (theory) in the same formats. Extended candidates can earn grades A*–G.
- Everyone: either Paper 5 (Practical Test) or Paper 6 (Alternative to Practical), each worth 40 marks and 20%.
Combined Science 0653 uses the same three-paper Core/Extended structure as the separate sciences. Co-ordinated Sciences 0654 is larger: its theory papers are 2 hours and 120 marks, reflecting that one paper is testing biology, chemistry and physics together for a double award.
The practical consequence: in the separate route, a student sits three sets of papers and has three chances to show strength; a weak physics result does not drag down biology. In Co-ordinated or Combined Science, the three subjects meet in the same papers, so a weak area in one science shows up in the single overall result. That is a reason to keep all three subjects moving evenly in the coordinated routes.
Choosing the tier
The tier decision is usually made by the school, often in Grade 10 after mock exams. A student aiming for an A or A* must be entered for Extended. A student who is consistently uncomfortable with the Extended content may be better served by Core, but should understand the grade ceiling of C. A tutor can help by working through Extended-only content early so the choice is based on real evidence rather than one bad test.
Which route suits a student heading to IB, A Level or CBSE Class 11
No exam board publishes a rule here; entry requirements for the next stage are set by the school or college your child will join. So the first step is always to ask the next school what they expect. With that caveat, these patterns are common sense:
| Next step | What to think about | Questions to ask the next school |
|---|---|---|
| IB Diploma with a science at higher level | The depth of the separate sciences gives a smoother start in the chosen subject. Co-ordinated Sciences can work if the student is strong in that subject. | Do you require a particular IGCSE grade, tier or route for HL Biology, Chemistry or Physics? |
| A Levels in one or more sciences | Separate sciences or Co-ordinated Sciences at Extended tier are the usual preparation. Combined Science covers less ground. | Which IGCSE science routes and grades do you accept for each A Level science? |
| CBSE or ISC Class 11 with PCM or PCB | Class 11 Indian syllabuses move quickly into quantitative physics and chemistry. Whatever the route, plan a bridging period for NCERT-style numericals. | What admission criteria apply to students coming from IGCSE, and which subjects can they take? |
| Undecided, or not planning to continue sciences | A lighter route can free time for other subjects. Keep options open if a science career is still possible. | Would a Combined Science grade restrict any subject choices later? |
Families planning a move from IGCSE into CBSE or ISC Class 11 will find our guide on switching between CBSE, IB and IGCSE useful for the bridging plan.
In Gurugram, Cambridge IGCSE appears at schools such as Lancers International School (DLF Phase 5), Scottish High International School (Sector 57), Shiv Nadar School (DLF City Phase 1) and The Shri Ram School (Moulsari, DLF City Phase 3); which science routes and tiers each school offers is the school's own decision, so ask the school directly.
What changes for the tutor: one tutor or three
The route your child is on changes the kind of help that works.
Separate sciences
Three subjects with three sets of papers often means two or three specialists, especially at Extended tier in Grade 10. Many students need help mainly in one subject: physics numericals, chemistry calculations, or the volume of biology. Start with the weakest and do not pay for three tutors by default. Our pages for IGCSE physics tutors in Gurgaon, IB and IGCSE chemistry tutors in Gurgaon and IGCSE biology tutors in Gurgaon explain what each specialist covers.
Co-ordinated or Combined Science
Because the three sciences are examined together, one tutor who is comfortable across all three often works well, with a specialist added only if one science is clearly lagging. The tutor must know which syllabus code the school follows: a tutor teaching from the 0625 Physics syllabus to a 0653 student will cover content that is not examined. See IGCSE science tutors in Gurgaon for this kind of all-round support.
Questions to ask any IGCSE science tutor
- Which syllabus code and year will you teach from, and have you taught that route before?
- How will you handle Core versus Extended content?
- How do you prepare students for Paper 5 or Paper 6?
- Will you work from Cambridge past papers and mark schemes for my child's syllabus?
Practical skills across the routes
In the separate sciences, the practical component is Paper 5 (Practical Test) or Paper 6 (Alternative to Practical), and Combined Science follows the same three-paper structure. Which one your child takes is normally arranged by the school. Either way, the skills are the same, and they are where many marks are lost.
Three examples of the skills involved (our illustrations, not Cambridge questions):
- Repeat readings and means. A student times a reaction three times and gets 42 s, 45 s and 60 s. The 60 s reading is anomalous; the mean of the other two is (42 + 45) ÷ 2 = 43.5 s. Students lose marks by averaging everything or by not saying why a reading was left out.
- Using a formula with units. A resistor has 6.0 V across it and 0.50 A through it, so R = V ÷ I = 6.0 ÷ 0.50 = 12 Ω. Marks depend on the unit and sensible significant figures, not only the number.
- Chemistry calculations. 4.4 g of carbon dioxide (molar mass 44 g/mol) is 4.4 ÷ 44 = 0.10 mol. Stoichiometry appears in the separate Chemistry syllabus as its own topic, and calculation slips here cost marks in every route.
Other habits a tutor should build: drawing results tables with units in the header, choosing sensible graph scales, describing a fair test by naming the variable changed, measured and controlled, and suggesting a specific improvement rather than "be more careful".
Edexcel equivalents, briefly
Pearson Edexcel runs its own International GCSE sciences, a separate board with its own papers. If your child's school follows Edexcel rather than Cambridge, the codes, paper structures and options are different, and this guide does not apply to them. Our Cambridge vs Edexcel IGCSE comparison sets out the differences using each board's own documents.
How NXTutors can help
NXTutors is based in Sector 66, Gurugram, and arranges home tutoring across Gurugram and online tutoring across India. Tell us the syllabus code (0610, 0620, 0625, 0653 or 0654), the tier and your area, whether that is Sector 53, Sector 54 or Sector 57, and we shortlist two or three matched tutors. You see each tutor's fee before the demo, the first class is a free demo, and switching tutor later is free. For the full range of Cambridge subjects, start from our IGCSE tutors in Gurgaon page.
Across NXTutors, most home-tuition sessions fall between ₹800 and ₹2,500 an hour; Classes 11–12, IB/IGCSE and JEE/NEET sit toward the upper end; specialists for IB HL or JEE Advanced can charge more.
You can also browse all local options on our page of home tutors in Gurgaon.
Frequently asked questions
What is the difference between IGCSE Combined Science 0653 and Co-ordinated Sciences 0654?
IGCSE Combined Science 0653 is a single award, while Co-ordinated Sciences 0654 is a double award worth two grades. 0653 covers Biology B1–B16, Chemistry C1–C12 and Physics P1–P5. 0654 covers Biology B1–B19, Chemistry C1–C12 and Physics P1–P6, is graded on a double scale from A*A* to GG, and has 2-hour, 120-mark theory papers.
Is IGCSE Co-ordinated Sciences the same as two IGCSEs?
IGCSE Co-ordinated Sciences 0654 is a double award, so the student receives a double grade such as AA or AB on a scale from A*A* to GG. It is still one syllabus covering biology, chemistry and physics, not two separate subjects. Because all three sciences meet in the same papers, a weak area in one science shows up in the overall result.
Can students in India sit IGCSE Combined Science in the March series?
Yes, students in India can sit IGCSE Combined Science 0653 in the March series, as well as in June and November, under Cambridge's 2025–2027 syllabus. The same applies to Co-ordinated Sciences 0654 and the separate sciences. Cambridge has already published 2028–2029 syllabuses for 0653 and 0654, so check the syllabus year of your child's exam and the school's entry plan.
Which practical paper do IGCSE separate-science candidates take?
Every IGCSE separate-science candidate takes either Paper 5, the Practical Test, or Paper 6, the Alternative to Practical, each worth 40 marks and 20% of the grade. Combined Science uses the same three-paper structure. Which paper a student sits is normally arranged by the school, so ask early, and practise results tables, graph scales and fair-test descriptions either way.
Which IGCSE science route suits a student heading to the IB Diploma?
For the IB Diploma, no exam board sets a rule on IGCSE science routes; the IB school decides its own entry requirements. The separate sciences give the most depth for a higher-level science, and Co-ordinated Sciences can work if the student is strong in that subject. Ask the next school which IGCSE route, tier and grade it expects for HL Biology, Chemistry or Physics.
Should we hire one IGCSE science tutor or three?
For IGCSE Co-ordinated or Combined Science, one tutor who covers all three sciences usually works, with a specialist added only if one science clearly lags. For the separate sciences at Extended tier, start with a specialist for the weakest subject and add others only if needed. Either way, the tutor must teach from your child's exact syllabus code and year.
What is the difference between Core and Extended tier in IGCSE science?
In IGCSE separate sciences, Core tier candidates can earn grades C–G, while Extended tier candidates can earn grades A*–G. Core candidates take Papers 1 and 3, Extended candidates take Papers 2 and 4 in the same formats, and everyone takes Paper 5 or 6. The school usually decides the tier in Grade 10 after mocks, and an A or A* needs Extended entry.
