Everything it does, on real numbers.

0:00 A science lab in your browser: all 28 AQA GCSE required practicals.

On screen: A title: "A science lab in your browser", over a measurement grid with a faint line of a real run's readings (Rates of reaction, run 1) drawing along the foot of the screen. The count 28 rolls up beside "AQA GCSE required practicals", then the 28 practicals are drawn as small apparatus sketches in three rows (Biology 10 · Chemistry 8 · Physics 10), the five the film visits are picked out, and the camera pushes into the first.

0:06 Readings are seeded for you. Misread the burette and the Lab says why. Then: 23.85 cm³.

On screen: Neutralisation (RP 2): beside a small picture of the 3D bench with the burette marked, a burette close up, the eye-level line settling on the meniscus at about 23.87 cm³. 26.15 is typed in the results table and refused: "You read the scale upside down. A burette reads 0.00 at the top and the numbers get bigger as you go down." Then 23.85 is typed and accepted.

0:11 The gas syringe at 0:30: 23 cm³. A potato cylinder after soaking: 1.72 g.

On screen: Rates of reaction (RP 5): the gas syringe's scale, the plunger moving out as the stopclock runs, its front edge on 23 cm³ at 0:30; recorded. Osmosis (RP 3): the balance shows 1.72 g for cylinder 0.6 A; recorded.

0:16 At 5:00, 33.0 °C and 12848 J. On 50 cm of wire, 1.85 V and 0.55 A.

On screen: Specific heat capacity (RP 1): the thermometer's thread rising to 33.0 °C and the joulemeter at 12848 J. Resistance (RP 3): the clip slides to 50 cm, the voltmeter reads 1.85 V and the ammeter 0.55 A. Each value is recorded in the student's colour.

0:22 Then the analysis, on your own numbers. Your osmosis curve crosses zero at 0.28 mol/dm³.

On screen: A results table of mean percentage change in mass against sucrose concentration in mol/dm³ (0.0: 18.1 %, 0.2: 5.8 %, 0.4: −8.8 %, 0.6: −19.2 %, 0.8: −22.0 %, 1.0: −22.1 %), plotted as a cursor sweeps across the graph, with a curve of best fit crossing zero at 0.28 mol/dm³.

0:27 The question uses your results. Divide by the final mass, tick the scheme: 0 of 2; the note names the slip.

On screen: Question 02.1 [2 marks]: "Calculate the percentage change in mass of the cylinder." Table 1: Initial mass in g 2.12, Final mass in g 2.53. The answer 16.2 % has the mark scheme beside it and you tick the points it earns, 0 out of 2, with the scheme's note: "You divided by the final mass. Divide by the initial mass: 0.41 ÷ 2.12 × 100 = 19.3 %."

0:32 Divide by the initial mass: 19.3 %, both marks ticked. Every practical ends in 30 to 33 marks of questions.

On screen: 19.3 % against the mark scheme: you tick 2 out of 2, a tick by each mark point: 0.41 ÷ 2.12 × 100 (change in mass ÷ initial mass × 100) and 19.3 (%). This practical's set has 17 parts and 30 marks.

0:38 One bank: over 4,000 questions on over 300 specification points. Filter by topic, tier and type.

On screen: The bank's count rolls up to 4,111 questions, 3,391 written and 720 multiple choice, across 25 topics; a bar splits them by type (multiple choice 720, short answer 1,683, calculation 596, graphs and data 281, choose an answer 664, 6-mark 167) and 313 small squares light up, one for each specification point. Filters are set one at a time: Rates of reaction (92), then Higher (88), then Calculation (7).

0:43 Every wrong option has a named trap. Pick 0.08 Ω and it tells you why; the answer is 12 Ω.

On screen: A multiple-choice question: "A resistor carries a current of 0.5 A when the potential difference across it is 6 V. What is its resistance?" Option D, 0.08 Ω, is picked: "Divides the current by the voltage, which turns the answer upside down." Then option C, 12 Ω, is right: "Use R = V ÷ I. Here 6 ÷ 0.5 = 12 Ω."

0:48 Plus Practise.

On screen: One card. Practise (Free): Sets of ten on every topic, marked as you go with the reason each wrong answer is tempting, and the ones you miss brought back to re-test.

0:52 Practical-section papers of 30 to 40 marks, in the exam's style, on your own results.

On screen: A paper's cover: AQA-style, GCSE Sciences · Required practicals, Practical skills paper. 10 questions, 34 marks, 34 minutes.

0:57 A sample on Resistance, Neutralisation and Osmosis: 34 marks in 34 minutes.

On screen: The paper's marks by skill: Variables 2, Method and risk 4, Reading and resolution 2, Calculations 9, Graphs and anomalies 5, Evaluation 6, 6-mark method 6.

1:02 Free, with no account: start with Rates of reaction, Osmosis and Specific heat capacity.

On screen: Three practicals to start with: Rates of reaction (Chemistry, RP 5), Osmosis (Biology, RP 3), Specific heat capacity (Physics, RP 1).

1:07 Every practical, every paper and the whole bank are free too.

On screen: Also free: Every practical in full, Run it again on new numbers, Papers on your own results, The six-mark coach and The whole-specification question bank.

1:11 Do the practical, then the exam on your own data.

On screen: The closing frame: "Do the practical. Then the exam, on your own data." over 28 practicals, 4,111 questions, free. Then the end card: start Rates of reaction, free. Not affiliated with or endorsed by AQA.