How to get an A or A* in Cambridge IGCSE Physics (0625)

Build a model before using an equation

Ask what system the question describes and what changes. For a moving object, identify the forces and their directions. For an electrical circuit, identify which components share a current or potential difference. A simple labelled sketch often prevents an equation from being used in the wrong situation.

For each equation you study, record the meaning and unit of every quantity, one situation where the equation is useful and one condition you must check. Then practise selecting an equation from a worded problem instead of only substituting into a named formula.

Make calculations easy to follow

Write the relationship, convert quantities into compatible units, substitute the values and present a final answer with units. Convert centimetres to metres before calculating areas or volumes; the conversion factor changes when the unit is squared or cubed.

Estimate the size of the answer before using a calculator. If your result suggests a classroom object has the mass of a ship, revisit the units and powers of ten. An estimate is an error detector, not an alternative to a complete calculation.

Explain the link between cause and effect

An explanation needs more than a keyword. If a question asks why a pressure changes, identify which particle behaviour changes and how that affects collisions. If it asks about acceleration, connect the resultant force to the change in motion.

Use comparative language precisely. Say what increases or decreases and what is kept constant. Avoid adding extra claims simply because they sound scientific; a contradictory sentence can weaken an otherwise good explanation.

Practise measurement and graphs weekly

For an investigation, identify the independent variable, dependent variable and important controls. Suggest a practical way to measure each quantity. Repeated readings can help identify anomalous results, but they do not automatically correct a consistent error in the apparatus.

When drawing graphs, use sensible scales and labelled units. Take a large triangle for a straight-line gradient rather than two nearby plotted points. Explain an improvement in terms of the particular measurement problem it solves.

Prepare the route you will actually sit

The Extended route is needed for A or A* in 0625; Core has a lower maximum grade. Your school also selects the practical test or alternative-to-practical route. Check the official syllabus for your exam year and use the correct component combination.

Practise multiple-choice reasoning as well as longer answers. For each distractor you reject, explain the misconception it represents. Save a timed mock until you can review it properly, then convert its errors into the next week’s short practice tasks.

Common mistakes—and how to fix them

Your four-week revision plan

Use this as a focused revision cycle alongside your lessons. If you are still learning the course, give unfamiliar topics more time before attempting full papers.

1. Week 1

   Identify weak concepts

   • Attempt a mixed set covering mechanics, waves and electricity.
   • Create an equation sheet with meanings, units and conditions.
2. Week 2

   Strengthen explanations

   • Write short cause-and-effect answers and have them checked.
   • Practise unit conversions and unfamiliar circuit diagrams.
3. Week 3

   Practise investigations

   • Interpret tables, draw graphs and calculate gradients.
   • Plan fair tests with measurable variables and realistic controls.
4. Week 4

   Combine the skills

   • Sit a timed paper for your tier and component.
   • Rework every lost calculation or explanation with a new question.

Your questions, answered