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TL;DR Combined Science private candidates sit one Paper 5 covering both science components in their combination (e.g., Physics and Chemistry for 5086). You need practical training in both components - not just one. Paper 5 is 1 h 30 min, 30 marks, 15% of your final grade. SEAB registration is 7–20 April 2026. Start practical training before then so the declaration you make at registration is truthful, and complete the course before the practical paper.
Who this guide is for
This guide is specifically for private candidates sitting Combined Science at O-Level:
5086 - Science (Physics, Chemistry)
5087 - Science (Physics, Biology)
5088 - Science (Chemistry, Biology)
If you are sitting Pure Science (6091 Physics, 6092 Chemistry, or 6093 Biology), the practical requirements are different - see the pure science practical guides instead.
Paper 5 at a glance
Paper 5 is the practical component shared by all three Combined Science syllabuses.
Detail
Value
Paper
Paper 5
Duration
1 h 30 min
Total marks
30 marks
Weighting
15% of final grade
Assessment strands
Experimental skills and investigations, including a modification / extension element
One or two compulsory questions on each science component
Key difference from Pure Science Paper 3: Paper 5 is shorter (1 h 30 min vs 1 h 50 min), worth fewer marks (30 vs 40), and carries a lower weighting (15% vs 20%). However, it still tests the same core strands - Manipulation/Measurement/Observation, Presentation of Data/Observations, and Analysis/Conclusions/Evaluation.
The two-component challenge
The unique difficulty for Combined Science private candidates is that Paper 5 covers two science disciplines in a single paper. For example, if you are sitting 5086 (Physics, Chemistry):
Section 1 may test a Physics apparatus task
Section 2 may test a Chemistry practical task
You need to be competent in both. This means your practical training must cover both components - you cannot just train in one.
Common centre-led training structure for Combined Science
Component
Basic practicals
Exam-style sessions
Total
Component 1 (e.g., Physics for 5086)
2 sessions
1 session
3
Component 2 (e.g., Biology for 5086)
2 sessions
1 session
3
Total per syllabus
4 basic
2 exam-style
6 sessions
Many centres use this 4 + 2 structure, but it is a preparation model rather than a published SEAB session-count rule.
What Paper 5 tests by combination
5086 - Science (Physics, Chemistry)
Physics component:
Measurements with metre rules, stopwatches, thermometers
Simple circuit setups with ammeters and voltmeters
Same chemistry techniques as listed for 5086 above
Biology component:
Same biology techniques as listed for 5087 above
How the SEAB declaration works for Combined Science
The practical training registration process for Combined Science follows the same structure as Pure Science:
Arrange supervised practical training covering both components of your syllabus
Keep attendance records for all sessions
Declare at registration that you either have sat the same subject before, or are currently attending or will be attending the practical course
Provide records if SEAB requests verification
The key point: SEAB treats Combined Science as one subject for registration purposes, but your training must cover two science disciplines. Make sure your centre's attendance records show sessions for both components.
Complete all 4 basic practicals (2 per component); practise data tables and observation language
7–20 April 2026
Register with SEAB; make the practical declaration
May–July
Complete exam-style sessions (1 per component); practise Paper 5 timing
August–September
Full Paper 5 mock under exam conditions; get script feedback
October–November
Practical exam
Common mistakes Combined Science private candidates make
Only training in one component. If you sit 5086 and only do physics practicals, you will be unprepared for the biology section of Paper 5.
Confusing Combined Science with Pure Science requirements. The syllabus codes, apparatus lists, and practical scope are different. Training designed for 6091 (Pure Physics) does not automatically cover the 5086 physics component - the overlap is partial.
Underestimating biology practical skills. Even if your stronger component is physics or chemistry, the biology section often requires biological drawing and observation language that needs specific practice.
Not practising under Paper 5 time constraints. Paper 5 gives you 1 h 30 min for two sections. Time management across two different science disciplines is a specific skill that needs practice.
Frequently asked questions
Can I choose which science components appear in my Paper 5? No. The components are fixed by your syllabus code. 5086 always tests Physics and Chemistry; 5087 always tests Physics and Biology; 5088 always tests Chemistry and Biology.
Is Paper 5 the same across all three Combined Science syllabuses? No. Each syllabus has its own Paper 5 paper with questions specific to its two components. 5086, 5087, and 5088 are different papers.
Can I use my Combined Science practical training to register for Pure Science instead? No. Combined Science and Pure Science are different syllabuses with different practical scopes. If you decide to switch from Combined Science to Pure Science, you need pure-science-specific practical training.
Which Combined Science combination is best for practical exam purposes? There is no universally "easier" combination. Choose based on your theory strengths and the subjects you need for further education. For a comparison of the three combinations, see 5086 vs 5087 vs 5088 - Which Combined Science Combination?.
I took Combined Science at school before - do I still need practical training? If you have already sat the same subject before, AskGov says that prior sitting is one way to satisfy the SEAB eligibility rule. Additional training may still be wise for exam readiness, but it is different from saying prior school experience never counts at all.
Where to train
Eclat Institute runs Combined Science practical sessions for private candidates. See the hub pages for scheduling:
