How to Revise GCSE Science Required Practicals
How to revise the GCSE science required practicals as method and evaluation — with exactly what to practise in biology, chemistry and physics.
How to Revise GCSE Science Required Practicals
Tutorwise Technologies LtdRevise the required practicals as method and evaluation, not as scripts to memorise. For every experiment on your exam board's list, you should be able to explain what was changed, what was kept the same, what was measured and why — and then judge how good the result was. GCSE science questions rarely ask you to recite the steps. They give you an unfamiliar version of a practical you have met and ask you to name the variables, read the data, spot the error, or improve the method. Revise for that, and the practicals become some of the most reliable marks in the whole paper.
The required practicals are a fixed, named list — find yours first
Every exam board publishes the exact set of practicals it will assess, and the marks are guaranteed to draw on them. The label changes by board: AQA calls them "required practicals", Edexcel calls them "core practicals", and OCR groups them into Practical Activity Groups, or PAGs. Whatever the name, the principle is the same — the list is closed and public, so you are never guessing what might come up.
The first job of revision is therefore administrative, not scientific. Confirm your board. Confirm whether you are sitting Combined Science, where the sciences are assessed together, or the separate sciences, where Biology, Chemistry and Physics are three GCSEs in their own right. Then download that board's practical list alongside its mark schemes. Combined Science covers a reduced set of practicals compared with the separate sciences, so revising from the wrong list wastes hours on experiments you will never be tested on. Getting this right at the start is the difference between efficient revision and busy revision.
Why they carry more marks than students expect
Practical work is not a side dish in GCSE science. According to Ofqual's subject-level conditions for GCSE sciences, at least 15 per cent of the marks in each science qualification must assess knowledge, skills and understanding related to practical work. Those marks are not sat in a lab. They are written into the ordinary written papers, spread across both papers as data questions, method questions and evaluation questions.
That matters because practical marks are so often under-prepared. Students revise the theory content thoroughly, treat the practicals as something they "did in class", and then lose straightforward marks on variables, units, or reading a graph. Because the list is fixed and the question types repeat year after year, this is some of the most trainable content in the subject — closer to a skill you can drill than a body of facts you have to hold in your head. That is the good news: it means these marks respond quickly to the right kind of practice.
How to revise one practical properly
Turn each practical into the same short set of questions, and answer them in writing. This is the method that replaces memorising a script:
- The aim — what was this experiment actually finding out? State it as a relationship: how one thing affects another.
- The variables — the independent variable (what you changed), the dependent variable (what you measured), and the control variables (what you kept the same to make it a fair test). Being fluent here earns marks in almost every practical question, whatever the topic.
- The method, in outline — enough to show you understand the sequence and the equipment, not a word-perfect recipe. For each step, know why it is there. Why filter here? Why repeat this reading?
- The results — what was measured, in what units, and how it was recorded and processed: a results table, a mean, a graph with the right axes.
- The evaluation — how good was the result, and how would you improve it? This is where the highest marks sit, and it is the step most students skip.
Write these five out for each practical from memory, then check them against the specification and a real mark scheme. The gap between what you wrote and what the mark scheme rewards is your revision list — precise, personal, and far more useful than re-reading a textbook chapter.
What to practise in biology
In biology, the practicals reward careful technique and clear control of variables. Expect to be tested on microscopy — preparing a slide, using a light microscope, and calculating magnification and real size. Food tests reward knowing which reagent produces which colour change, and why: Benedict's for reducing sugars, iodine for starch, Biuret for protein, and the emulsion or ethanol test for lipids. The osmosis practical, using plant tissue in a range of sugar or salt concentrations, is a favourite for percentage-change calculations and for explaining why a single value might be anomalous. The effect of light intensity on the rate of photosynthesis brings in the inverse-square relationship, and the enzyme practicals — the effect of pH or temperature on activity — test control variables hard. If you sit separate Biology, add microbiology, culturing microorganisms and measuring the zone of inhibition around antiseptics, and the field-sampling techniques of quadrats and transects.
What to practise in chemistry
Chemistry practicals are the ones where method precision earns the marks. Making a pure, dry sample of a soluble salt tests every step for a reason — why you add the base in excess, why you filter off what is left, why you crystallise rather than evaporate to dryness. Titration rewards the language of accuracy: reading a burette to the right precision, using a suitable indicator, repeating until you get concordant results, and calculating a mean titre from the concordant values only. Rates of reaction appear in two classic forms — measuring the volume of gas given off over time, and the disappearing-cross turbidity method with sodium thiosulfate — and both lead into graph interpretation. Electrolysis, energy changes in reactions (distinguishing exothermic from endothermic), and paper or thin-layer chromatography with Rf calculations complete the core. Separate Chemistry adds the tests used to identify ions, including flame tests and the colours of precipitates.
What to practise in physics
Physics practicals are heavy on measurement, units and graphs. The resistance practicals — investigating how the length of a wire affects resistance, and how components behave in series and parallel — underpin much of the electricity content, so know the circuit diagrams and why an ammeter goes in series while a voltmeter goes in parallel. Force and extension, which is Hooke's law in practice, tests the limit of proportionality and reading the linear region off a graph. Acceleration practicals, using light gates or a trolley and ramp, connect straight to the motion equations. Specific heat capacity, the density of regular and irregular solids, and waves — measuring frequency and wavelength on a ripple tank or along a string — complete the common set. In every one of them the examinable skill is the same: take repeat readings, handle units correctly, plot the data sensibly, and read a gradient or an intercept off the line.
The evaluation questions are where grades are won or lost
The step most students skip is evaluation, and it is exactly where the higher-tariff marks live. These questions ask you to judge data and method using a small, precise vocabulary. Learn to use it correctly, because the exam tests whether you can:
- Tell accurate from precise. Accurate means close to the true value; precise means the readings are close to each other. They are not the same thing, and questions are written to catch students who treat them as interchangeable.
- Tell repeatable from reproducible. Repeatable means the same person gets similar results repeating the same method; reproducible means someone else, or a different method, gets similar results.
- Handle anomalies. Know how to identify a result that does not fit the pattern, that you should leave it out when calculating a mean, and that ideally you would repeat it.
- Separate random from systematic error. Random error is reduced by repeating and averaging; systematic error is a consistent offset, often from the equipment or how it was set up, and repeating will not remove it.
When a question shows you a table or a graph from an unfamiliar experiment and asks you to evaluate the method or suggest an improvement, it is testing this vocabulary and nothing more exotic. Practising it against real past-paper mark schemes is the single highest-return thing most students can do on the practicals, because it turns knowledge they already have into marks they were previously dropping.
A revision routine that actually holds
Spread the practicals across your revision rather than saving them for the last fortnight. Take one practical per short session: write the five-part breakdown from memory, then mark it against the specification and a mark scheme. Bring in past-paper practical questions early, because the exam version is always a twist on the classroom version, and the twist is the whole point. Reconstructing the method and variables from a blank page beats re-reading your notes, because the exam asks you to produce an answer, not to recognise a familiar page. A little of this each week, from early in the year, does far more than a single long session the night before.
Finding a tutor who knows your exact board
If you want targeted help, the required practicals are a good test of whether a tutor genuinely knows the subject. Ask them which board you are on and which practicals it assesses, and a strong tutor will answer without hesitation. On Tutorwise, you are not judging that on a self-written bio. Each tutor carries a credibility score built from checked signals — verified identity and a DBS check, confirmed qualifications, and a real record of teaching and reviews — so you start from evidence rather than a claim. Use a first session, and your own board-specific question, to confirm the fit before you commit.
More on GCSE science and revision
Frequently asked questions
What are the GCSE science required practicals?
They are a fixed, published set of experiments every GCSE science student carries out, and which the exams are guaranteed to draw on. Boards name them differently — AQA calls them required practicals, Edexcel calls them core practicals, and OCR uses Practical Activity Groups — but each board lists exactly which experiments it will assess across biology, chemistry and physics. The questions test your understanding of the variables, method, results and evaluation, not just whether you carried the experiment out.
How much of the exam do the required practicals count for?
A guaranteed share of every science paper. Ofqual sets a minimum proportion of marks in each GCSE science that must assess practical knowledge and skills, so these marks appear reliably, spread across both written papers rather than in a separate practical exam. Because the list of practicals is fixed and the question styles repeat, they are among the most predictable marks available — and among the most commonly under-revised.
Do I need to memorise the exact method for each practical?
No, and trying to is the wrong approach. Questions rarely ask you to recite a method word for word. They give you an unfamiliar version of a practical and ask you to identify the variables, read the data, find the error or improve the method. Learn each practical as a structure instead: the aim, the variables, the outline method and why each step matters, the results, and the evaluation. That is what the mark schemes actually reward.
Are the required practicals the same for Combined Science and the separate sciences?
No. Combined Science assesses a reduced set compared with separate Biology, Chemistry and Physics, so it matters that you revise from the correct list. Confirm with your teacher or your board's specification whether you are sitting Combined Science or the three separate GCSEs before you start, then work from that board's exact practical list and mark schemes. Revising practicals you will not be tested on is wasted effort.
How can a tutor help with the required practicals?
A good tutor can turn the practicals from a weak spot into reliable marks quickly, because the content is fixed and skills-based. The useful test is whether the tutor knows your exact board and its practical list — ask, and a strong one will answer at once. On Tutorwise, each tutor carries a credibility score built from verified identity and a DBS check, confirmed qualifications and a real record of teaching, so you can judge them on evidence rather than a written pitch before booking a first session.