OCR 21st Century GCSE Combined Science required practicals: A complete guide

If you're on OCR Twenty First Century Combined Science B (spec code J260), the double award, there are 16 compulsory Practical Activity Groups you need to know. OCR calls them "PAGs" rather than required practicals: each PAG is a group of techniques, and your school picks one specific activity (or devises its own) that covers the apparatus and skills listed.

This guide walks through all 16 PAGs, explains how they're distributed across the four-paper OCR B Combined structure (three subject papers plus one shared synoptic), and sets out the three important ways OCR B Combined differs from OCR Gateway Combined A (J250). Different boards use different language for the same idea: OCR says "PAGs", AQA says "required practicals", Edexcel says "core practicals". This article is OCR Twenty First Century Combined (OCR B) only.

The spec's own wording reads: "It is compulsory that learners complete at least sixteen practical activities. OCR has split the requirements from the Department for Education 'GCSE subject content and assessment objectives' into sixteen Practical Activity Groups or PAGs, five biology, five chemistry and six physics." At Higher tier the paper codes are J260/05 Biology, J260/06 Chemistry, J260/07 Physics and J260/08 Combined Science (the synoptic paper). Each subject paper is 95 marks and 26.4% of the qualification; the synoptic paper is 75 marks and 20.8%, totalling 360 marks.

Note the "and 8" running through every row. The synoptic paper (J260/08) draws questions from all three sciences and all 16 PAGs, which is why practice on each PAG shows up in two places on your paper schedule rather than one.

OCR B Combined has four papers per tier at Higher. Papers 5, 6 and 7 are subject-focused Biology, Chemistry and Physics, each 1 hour 45 minutes and 95 marks. Paper 8 is the Combined Science synoptic paper, 1 hour 45 minutes and 75 marks, drawing from all three sciences and from the BCP7 Ideas about Science chapter. Every Higher-tier J260 candidate sits the same Paper 8 (Foundation candidates sit the equivalent Paper 4).

There's no separate practical exam. Your school signs a Practical Science Statement via the NEA Centre Declaration Form confirming you've completed at least 16 practical activities. OCR's wording in the spec: "No less than 15% of the questions will assess practical skills." AO1 (demonstrate knowledge and understanding) and AO2 (apply knowledge and understanding) each account for 40% of the overall grade; AO3 (analyse information and ideas; interpret and evaluate; develop and improve experimental procedures) accounts for 20%.

The practical-skills chapter on OCR B Combined is Chapter BCP8. Alongside BCP7 Ideas about Science, it's one of the two "synoptic" chapters that weave through every paper and especially through the shared Paper 8. Expect BCP7-style framing on Paper 8: real-world contexts (vaccination debate, climate evidence, screening programmes, material-choice ethics) that invite you to reason about uncertainty, model limitations, and whether a conclusion is justified by the data.

OCR Twenty First Century Combined B differs from OCR Gateway Combined A on three big axes.

Paper structure. Gateway Combined (J250) uses 6 papers per tier (2 per science). OCR B Combined (J260) uses 4 papers per tier: 3 subject-focused papers at 95 marks each, plus 1 shared synoptic paper at 75 marks. The synoptic paper is unique to OCR B Combined and is the same paper for Biology, Chemistry and Physics content. If a question references PAG C5 and PAG P3 in the same answer, you're almost certainly looking at a Paper 8 question.

Practical skills integration. The PAG count is the same (16 on both specs, 5 Biology + 5 Chemistry + 6 Physics). Gateway Combined labels its practical skills topic CS7 (Topic CS7: Practical skills), which appears in each of the Biology, Chemistry and Physics sections, while OCR B Combined uses Chapter BCP8, which spans the subject papers AND the synoptic paper.

Narrative framing and BCP7 Ideas about Science. OCR B wraps every chapter in a narrative-led, real-world context. Chapter BCP7 is Ideas about Science, examined through every paper (including the synoptic). Gateway doesn't have this chapter. OCR B exam questions therefore often sit on a scaffolding (vaccination, screening, radiation safety, material-choice trade-offs) that would feel out of place on a Gateway paper.

Note on Breadth and Depth: those labels apply to the OCR B separate sciences (J257, J258, J259), not to OCR B Combined. OCR B Combined uses the 4-paper structure described above, not Breadth and Depth.

Combined (J260) has fewer PAGs than the three separate OCR B sciences. Separate totals: 8 PAGs for Biology (J257) + 8 for Chemistry (J258) + 8 for Physics (J259) = 24. Combined totals: 5 + 5 + 6 = 16.

The separate 21st Century specs (J257 / J258 / J259) label their PAGs as integers, PAG 1 to PAG 8, the letter-prefixed B1 to B5, C1 to C5, P1 to P6 labels in this guide apply only to Combined J260.

The Combined PAG list is a subset of the separates:

• Biology drops PAG 2 Testing for biological molecules, PAG 6 Physiology/responses/respiration, and PAG 8 Transport in and out of cells (three extra PAGs on the separate Biology spec).
• Chemistry drops PAG 1 Reactivity trend, PAG 5 Identification of species, and PAG 6 Titration (three extra PAGs on the separate Chemistry spec).
• Physics merges content back together: the separate Physics spec splits Circuit components (PAG 6) and Series and parallel circuits (PAG 7), and gives Interactions of waves its own PAG (8). Combined re-merges these into a single circuits PAG (P6) and folds reflection and refraction into the Waves PAG (P4).

If you're on Combined, don't revise titration, flame tests for ions, or Interactions of waves as separate PAGs. The underlying science of some of this content still appears in Combined where it's directly relevant, but not as a dedicated PAG you need to describe end to end.

Reading through the method isn't enough. PAGs test whether you can think like a scientist, not whether you can recite a recipe.

For each PAG, pick the specific activity your class ran, and write the method out from memory. Then check it against your notes or a Cognito video. The steps you forgot are the ones that would have cost you marks. Pay attention to the small details OCR likes to probe: incubating microbiology plates at 25 degrees Celsius rather than 37, taping agar lids rather than sealing them, calculating R_f as substance distance over solvent distance, using a random number generator to place quadrats, reading voltmeters and ammeters at eye level to avoid parallax error.

Prepare answers for the four question types that keep coming up for every PAG: method, variables, explanation of results, evaluation and improvement. A specific improvement with a specific reason, not "repeat it".

For Paper 8, practise connecting a PAG to BCP7 reasoning. The synoptic paper rewards you for naming the sources of uncertainty (sample size, confounders, variability) rather than just reporting the result, and for drawing a conclusion with appropriate hedging rather than overstating it.

Work through past paper questions by PAG. OCR recycles wording and graph shapes year on year, and the mark schemes are the clearest guide to the exact phrases they want. For strategies on moving from grade 7 or 8 to grade 9, our guide to getting a grade 9 in GCSE Combined Science walks through mark-scheme patterns and what separates the grade bands.

Our OCR Twenty First Century GCSE Combined Science courses cover every one of the 16 PAGs through short video lessons, worked examples and exam-style questions. Each PAG has its own lesson walking through the technique, apparatus, variables and exam language. Head into the Combined Science Biology course, the Combined Science Chemistry course or the Combined Science Physics course. For the wider shape of the qualification, our complete guide to OCR Twenty First Century GCSE Combined Science covers the four-paper structure, chapter list and timing in one place.