OCR 21st Century GCSE Physics required practicals: A complete guide

If you're on OCR Twenty First Century Physics B (spec code J259), there are 8 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 8 OCR B Physics PAGs in the specification's own order, explains how they're examined across the Breadth and Depth papers, and sets out the ways OCR B differs from OCR Gateway Physics A (J249). 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 (OCR B) only. If you're on AQA, our AQA required practicals guide explains all 10 AQA practicals.

The OCR specification states that learners must complete at least eight practical activities, which OCR has split into eight Practical Activity Groups (PAGs) based on the Department for Education's GCSE subject content for Biology, chemistry and physics. OCR B labels its PAGs PAG1 to PAG8. Gateway separate Physics (J249) refers to the same groups as PAG P1 to PAG P8, so letter-prefixed codes are not unique to Combined Science. At Higher tier the papers are J259/03 (Breadth) and J259/04 (Depth), each 1 hour 45 minutes, 90 marks, 50% of the qualification.

Because each PAG is a group of techniques rather than a prescribed experiment, two schools can teach PAG 3 using different kit (one with light gates, one with ticker tape and timers) and both are valid. OCR publishes example activities but centres can substitute.

There's no separate practical exam for OCR B Physics. Practical skills are examined through written questions on both the Breadth and Depth papers, and your school signs a Practical Science Statement confirming you've completed the PAGs. The OCR specification states: "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%.

Physics carries the highest mathematics floor of the three sciences (set by Ofqual at 30% for Level 2 Physics): about 30% of marks across the papers need to involve calculation, formula rearrangement or data analysis. Several PAGs lean into that, PAG 3 Motion (equations of motion, gradients from distance-time and velocity-time graphs), PAG 5 Energy (specific heat capacity, E = mc*ΔT), PAG 6 Circuit components (V = IR and gradient interpretation). An equations booklet is provided in every OCR B Physics paper, so you don't need to memorise every formula, but you do need to be fluent in rearranging and applying them.

OCR B also runs a chapter called P7 "Ideas about Science" on separate J259. It isn't a PAG, but it covers scientific method, data interpretation and ethics, often framed around real-world contexts. Many of the Depth-paper extended-response questions sit at the intersection of a PAG and P7.

The practical-skills chapter on OCR B separate Physics is Chapter P8.

OCR Twenty First Century Physics B and OCR Gateway Physics A share the same 8 PAG groupings with closely parallel titles, but label them differently in the spec PDFs. The two routes diverge on paper structure and chapter framing as well as on labelling.

Labelling and groupings. OCR B labels the PAGs PAG1 to PAG8; Gateway J249 labels the same 8 groups PAG P1 to PAG P8. A resource tagged to a J249 PAG generally applies to the same J259 PAG. The Gateway Combined spec J250 merges some PAGs into fewer groupings (P1-P6), but that's the Combined spec, not the separate J249 route.

Paper structure. Gateway separate Physics splits content between papers using topic chapter labels. OCR B uses Breadth and Depth: both papers cover all chapters, differentiated only by question style. Breadth is multi-topic shorter questions; Depth is deeper application and extended-response synoptic reasoning. Don't go into the exam expecting "Paper 1 covers topics X to Y" on OCR B.

Chapter names. OCR B chapters use narrative-led titles: P1 Radiation and waves, P2 Sustainable energy, P3 Electric circuits, P4 Explaining motion, P5 Radioactive materials, P6 Matter, models and explanations, P7 Ideas about Science, P8 Practical skills. Gateway uses more conventional labels. Swapping chapter labels between the two courses is a common revision slip.

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 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: measuring at eye level to avoid parallax, taking repeat readings and calculating a mean, naming light gates vs ticker tape in PAG 3 and the specific advantage of each (light gates reduce reaction-time error; ticker tape gives a continuous record), measuring springs beyond the limit of proportionality in PAG 2 and recognising the point where Hooke's law breaks down.

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

Sketch the graphs you'd expect for the quantitative PAGs. For PAG 2 Forces, a force-extension graph that is linear through the origin until the limit of proportionality, after which it curves. For PAG 3 Motion, a velocity-time graph with gradient equal to acceleration. For PAG 5 Energy, a temperature-time graph where you can calculate specific heat capacity from the gradient. For PAG 6 Circuit components, the characteristic shapes of I-V for an ohmic resistor (straight line through origin), a filament lamp (S-shape) and a diode (zero in reverse, sharp rise after a threshold forward voltage).

For the Depth paper, practise linking a PAG to P7 Ideas about Science reasoning. A question on PAG 5 (specific heat capacity) can swerve into evaluating a claim about energy efficiency, or a question on PAG 1 (density) might ask you to decide which of two materials is more suitable for a given purpose given uncertainty in the data.

Work through past paper questions by PAG. OCR recycles both wording and graph shapes year on year, and the mark schemes are the clearest guide to the exact phrases they want. Our guide to the hardest GCSE Physics topics ranks the topics by difficulty if you want to prioritise your time.

Our OCR Twenty First Century Physics course covers all 8 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. Jump into the OCR B Physics course and track your progress through the whole spec. For the wider shape of the qualification, our complete guide to OCR Twenty First Century GCSE Physics covers Breadth and Depth paper structure, chapter list and timing in one place.