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A topic-by-topic revision guide for OCR A-Level Physics A (H556) circular motion, simple harmonic motion and gravitation — centripetal force, SHM equations, energy in SHM, damping, resonance, Newton's law of gravitation, gravitational potential, Kepler's laws and orbits.

A topic-by-topic revision guide for OCR A-Level Physics A (H556) electricity and circuits — current, charge, EMF, resistance, Ohm's law, resistivity, internal resistance, Kirchhoff's laws and potential dividers.

A topic-by-topic revision guide for OCR A-Level Physics A (H556) foundations and measurement — SI units, derived units, uncertainties, errors, scalars and vector resolution.

A topic-by-topic revision guide for OCR A-Level Physics A (H556) motion, forces and materials — SUVAT kinematics, dynamics, inclined planes, work-energy-power and the Young modulus.

A topic-by-topic revision guide for OCR A-Level Physics A (H556) Newton's laws and momentum — the three laws, linear momentum, impulse, conservation, elastic and inelastic collisions, explosions.

A topic-by-topic revision guide for OCR A-Level Physics A (H556) nuclear, particle and medical physics — radioactivity, mass-energy equivalence, the Standard Model and medical imaging (X-ray, CT, ultrasound, PET).

A topic-by-topic revision guide for OCR A-Level Physics A (H556) quantum physics — the photon model, photoelectric effect, de Broglie wavelength, electron diffraction, energy levels and line spectra.

A topic-by-topic revision guide for OCR A-Level Physics A (H556) thermal physics and gases — temperature, internal energy, specific heat, latent heat, gas laws, ideal gas equation and kinetic theory.

A topic-by-topic revision guide for OCR A-Level Physics A (H556) waves and optics — wave motion, superposition, polarisation, interference and stationary waves.

A topic-by-topic revision guide for OCR A-Level Chemistry A (H432) acids, bases and buffers — Brønsted definitions, Kw and pH, weak acid Ka, pH of weak acids and strong bases, buffer principle and pH, titration curves, indicator selection.

A topic-by-topic revision guide for OCR A-Level Chemistry A (H432) acids, redox, electron configuration and bonding — Brønsted-Lowry, oxidation numbers, half-equations, orbitals, ionic/covalent/metallic bonding, electronegativity, VSEPR shapes and intermolecular forces.

A topic-by-topic revision guide for OCR A-Level Chemistry A (H432) alcohols, haloalkanes and basic analysis — alcohol oxidation and dehydration, nucleophilic substitution, SN1 vs SN2, CFCs and ozone, synthesis techniques, IR and mass spectrometry.