How long should I study for the GRE Physics Subject Test?

Most test takers spend three to six months, working through past released exams alongside targeted review of weak clusters. If your undergraduate coursework is recent and complete, the bottleneck is usually pacing rather than content, and shorter, timed practice cycles are more useful than rereading textbooks.

Do graduate programmes still require the physics subject test?

Requirements vary widely by programme and have changed considerably in recent years — some departments dropped it, some made it optional, some still expect it. Check each department's admissions page directly for the cycle you are applying in, since a strong score can still help at programmes where it is optional.

What formulas do I need to memorise?

Only a table of physical constants is supplied. You need working recall of Maxwell's equations, the standard Lagrangian and Hamiltonian forms, the hydrogen energy levels and Bohr radius, the harmonic oscillator spectrum, cycle efficiencies, relativistic invariants, and common moments of inertia. Sessions include drilling these to the point of instant retrieval rather than reconstruction.

Is it worth guessing on questions I do not know?

There is no penalty for wrong answers on the current format, so every question should be answered. The useful skill is partial elimination — cutting two or three choices on dimensional or limiting-case grounds before guessing — and sessions practise this explicitly on problems outside your strong areas.

GRE Physics Subject Test

Graduate Tests · Test Prep

The GRE Physics Subject Test asks 100 multiple-choice questions in 170 minutes — roughly 100 seconds each — across the full undergraduate physics curriculum, with no calculator and only a short table of constants provided. Success depends less on deep derivation skill than on recognising a problem type instantly, choosing the fastest route to an answer, and knowing when to eliminate rather than solve. These sessions work through the five content clusters that dominate the exam (mechanics, E&M, quantum, thermo/statistical mechanics, and the atomic/optics/relativity group) with an emphasis on speed under the 1.7-minute constraint and on the scaled 200–990 score's sensitivity to raw-count gains.

Start a session on GRE Physics Subject Test

What this covers

Lagrangian and Hamiltonian setups, central-force orbits, rigid-body moments of inertia, and small-oscillation normal modes at exam pace
Electrostatics via Gauss's law and image charges, circuits with RC/RL/LC time constants, Maxwell's equations in integral form, and EM wave impedance and polarisation
Quantum mechanics: infinite and finite wells, harmonic oscillator ladder operators, hydrogen quantum numbers, angular momentum addition, perturbation theory to first order, and expectation-value shortcuts
Statistical mechanics and thermodynamics: Carnot and other cycle efficiencies, equipartition, and distinguishing Maxwell–Boltzmann, Fermi–Dirac, and Bose–Einstein occupancy
Special relativity four-vectors, invariant mass in collisions, Doppler shift, and atomic/nuclear topics including selection rules, Zeeman and Stark splitting, and decay chains
Test technique: dimensional analysis, limiting cases, order-of-magnitude estimation, and calibrated guessing to convert partial knowledge into raw points

Where learners get stuck

Solving every problem completely instead of eliminating answers by units, limits, or symmetry: Coursework rewards full derivations and correct algebra, so students default to that habit. The exam's answer choices usually differ in dimensions or in behaviour as a parameter goes to zero or infinity, which resolves many items in fifteen seconds. Breaking the derivation reflex takes deliberate practice, not more content review.
Mixing up the three statistical distributions and forgetting degeneracy factors: Undergraduate stat mech courses often introduce Fermi–Dirac and Bose–Einstein late and briefly. Students remember the functional forms but not which applies to photons versus electrons versus a dilute classical gas, and they omit the g-factor when computing specific heats or blackbody results.
Treating relativistic energy and momentum as separate formulas to memorise rather than components of one invariant: Introductory treatments present E = γmc², p = γmv, and E² = p²c² + m²c⁴ as a list. In collision and decay problems the fast route is conserving the four-momentum and using the invariant, but students who learned the equations as a list start substituting γ and stall on algebra they have no time for.
Sign and convention errors in geometric optics and induced EMF: Different textbooks use different sign conventions for focal length, magnification, and Lenz's law direction. Under time pressure students apply a half-remembered rule and arrive at an answer that appears among the distractors, so the error goes undetected.

What a session looks like

Sessions run as spoken problem-solving. You are given an exam-style item, talk through your approach out loud, and get interrupted when a faster path exists — a symmetry argument, a limiting case, a unit check. Because there is no shared screen, problems are chosen to be stated and reasoned aloud, and the tutor tracks which content clusters and which failure modes (setup errors, algebra collapse, timing overruns) recur across your attempts. Sessions can also be used to drill a single area, such as forty minutes purely on quantum mechanics items, or to review a timed practice set question by question.

Helpful to know first

Completed or nearly completed undergraduate courses in classical mechanics, electricity and magnetism, and quantum mechanics at the level of Taylor, Griffiths, and Griffiths respectively
Working comfort with multivariable calculus, differential equations, linear algebra (eigenvalue problems), and complex exponentials
Some exposure to thermodynamics and statistical mechanics, optics, and special relativity, even if only at the sophomore modern-physics level
At least one timed full-length practice test attempted, so there is a baseline score and a picture of pacing

Questions

How long should I study for the GRE Physics Subject Test?: Most test takers spend three to six months, working through past released exams alongside targeted review of weak clusters. If your undergraduate coursework is recent and complete, the bottleneck is usually pacing rather than content, and shorter, timed practice cycles are more useful than rereading textbooks.
Do graduate programmes still require the physics subject test?: Requirements vary widely by programme and have changed considerably in recent years — some departments dropped it, some made it optional, some still expect it. Check each department's admissions page directly for the cycle you are applying in, since a strong score can still help at programmes where it is optional.
What formulas do I need to memorise?: Only a table of physical constants is supplied. You need working recall of Maxwell's equations, the standard Lagrangian and Hamiltonian forms, the hydrogen energy levels and Bohr radius, the harmonic oscillator spectrum, cycle efficiencies, relativistic invariants, and common moments of inertia. Sessions include drilling these to the point of instant retrieval rather than reconstruction.
Is it worth guessing on questions I do not know?: There is no penalty for wrong answers on the current format, so every question should be answered. The useful skill is partial elimination — cutting two or three choices on dimensional or limiting-case grounds before guessing — and sessions practise this explicitly on problems outside your strong areas.