GRE Subject Tests: When Indian Students Need Them and How to Prepare

What Are GRE Subject Tests?

The GRE Subject Tests are specialised examinations that test advanced knowledge in specific academic disciplines. Unlike the GRE General Test, which measures general verbal, quantitative, and analytical writing skills, Subject Tests assess your mastery of the content taught in an undergraduate major. For Indian students applying to highly competitive graduate programmes -- particularly in the sciences and mathematics -- these tests can be a powerful differentiator.

As of 2026, ETS offers GRE Subject Tests in four disciplines:

• Physics
• Mathematics
• Psychology
• Chemistry (discontinued September 2023, but scores from prior administrations remain valid for 5 years)

Each Subject Test is scored on a scale of 200-990 in 10-point increments. Percentile rankings are also reported, which are often more useful than the raw score since the scoring scales differ across subjects.

When Do Indian Students Need GRE Subject Tests?

Not every graduate programme requires or even recommends Subject Tests. The key is understanding which programmes value them and which do not.

Programmes That Commonly Require or Strongly Recommend Subject Tests

• Physics PhD programmes: Nearly all top physics PhD programmes in the US require or strongly recommend the Physics GRE. MIT, Caltech, Stanford, Harvard, Princeton, UC Berkeley, and Chicago all expect Physics GRE scores. This is the most commonly required Subject Test for Indian applicants.
• Mathematics PhD programmes: Many top maths PhD programmes require or recommend the Mathematics GRE. Harvard, MIT, Princeton, Stanford, and Chicago are among them. However, some programmes (like Berkeley's) have made it optional.
• Psychology PhD programmes: Some clinical and cognitive psychology PhD programmes recommend the Psychology GRE. This is less universally required than Physics or Maths.
• Interdisciplinary programmes: Some programmes in biophysics, applied mathematics, or computational neuroscience may recommend a Subject Test in a related field.

Programmes That Typically Do Not Require Subject Tests

• Engineering (MS and PhD): Most engineering programmes rely on the GRE General Test and do not require Subject Tests. This includes computer science, electrical engineering, mechanical engineering, and civil engineering.
• Business programmes (MBA, MS): Use the GMAT or GRE General Test.
• Humanities and social sciences (non-psychology): Rely on the GRE General Test, writing samples, and statements of purpose.
• Master's programmes in science: Even in physics and maths, Master's programmes rarely require Subject Tests. The requirement is primarily for PhD programmes.

The Indian Student's Decision Framework

If your target programme lists the Subject Test as "required," you obviously must take it. If it is listed as "recommended" or "optional," the calculus is more nuanced:

• Take it if: You are applying to highly competitive PhD programmes (top 20), you have a strong background in the subject and can reasonably expect a score above the 70th percentile, and you want an additional data point to strengthen your application.
• Skip it if: Your target programmes do not mention it, you are applying to Master's programmes, or you estimate your score would be below the 50th percentile (a low Subject Test score can hurt more than the absence of a score).

GRE Physics Subject Test

The Physics GRE is the most commonly taken Subject Test by Indian students. It is a challenging exam that tests undergraduate-level physics comprehensively.

Format

• 100 five-choice multiple choice questions
• 170 minutes (2 hours 50 minutes)
• No breaks
• Covers classical mechanics, electromagnetism, optics, thermodynamics, statistical mechanics, quantum mechanics, atomic physics, nuclear physics, special relativity, and laboratory methods

Content Breakdown

• Classical mechanics (20%): Newtonian mechanics, Lagrangian and Hamiltonian formulations, orbital mechanics, rigid body dynamics, oscillations
• Electromagnetism (18%): Electrostatics, magnetostatics, electromagnetic waves, Maxwell's equations, circuits, electromagnetic induction
• Optics and wave phenomena (9%): Interference, diffraction, polarisation, geometric optics
• Thermodynamics and statistical mechanics (10%): Laws of thermodynamics, statistical ensembles, ideal gas, Bose-Einstein and Fermi-Dirac distributions
• Quantum mechanics (12%): Wave functions, Schrödinger equation, angular momentum, perturbation theory, hydrogen atom
• Atomic physics (10%): Atomic structure, spectra, selection rules, Zeeman effect, fine structure
• Special relativity (6%): Lorentz transformation, relativistic kinematics, mass-energy equivalence
• Laboratory methods (6%): Instrumentation, data analysis, error analysis
• Specialised topics (9%): Nuclear and particle physics, condensed matter, astrophysics

Preparation Strategy for Indian Students

Indian students with BSc Physics or MSc Physics backgrounds typically have strong content knowledge. The challenge is the breadth of the test (it covers all of undergraduate physics in one sitting) and the time pressure (less than 2 minutes per question).

• Primary resource: "Conquering the Physics GRE" by Yoni Kahn and Adam Anderson. This is the definitive preparation book, written by physics PhD students. It covers every topic with practice problems calibrated to the test's difficulty level.
• Past papers: ETS has released several past Physics GRE papers. Work through all of them under timed conditions. These are the most accurate representation of what you will encounter.
• Focus on speed: You cannot spend 5 minutes on a single problem. Many questions can be solved by dimensional analysis, estimation, or elimination of wrong answers. Practice quick approaches alongside formal solutions.
• Cover the gaps: Indian BSc programmes sometimes underemphasise certain topics like Lagrangian/Hamiltonian mechanics, statistical mechanics distributions, or laboratory methods. Identify your gaps early and fill them systematically.

Target Scores

• Top 10 physics PhD programmes: 900+ (90th percentile or above)
• Top 10-30 programmes: 800-900 (70th-90th percentile)
• Top 30-50 programmes: 700-800 (50th-70th percentile)

GRE Mathematics Subject Test

The Maths GRE tests undergraduate mathematics comprehensively. It is required or recommended by many top mathematics PhD programmes.

Format

• 66 five-choice multiple choice questions
• 170 minutes (2 hours 50 minutes)
• Covers calculus, algebra, real analysis, complex analysis, linear algebra, topology, number theory, combinatorics, and probability/statistics

Content Breakdown

• Calculus (50%): Single-variable and multivariable calculus, differential equations, sequences and series. This is the largest component and should be the foundation of your preparation.
• Algebra (25%): Linear algebra, abstract algebra (groups, rings, fields), number theory.
• Additional topics (25%): Real analysis, complex analysis, topology, combinatorics, probability, statistics, and other advanced topics.

Preparation Strategy for Indian Students

Indian mathematics students from strong programmes (ISI, CMI, IITs, IISER) typically have the content knowledge needed. The test's difficulty lies in its breadth and the need for computational speed.

• Primary resources: "Cracking the GRE Mathematics Subject Test" by Steven Leduc (Princeton Review) provides good topic review and practice problems. Supplement with the ETS practice test.
• Calculus is king: Half the test is calculus. If you can score nearly perfectly on calculus questions, you only need moderate performance on algebra and additional topics to reach a strong overall score. Review multivariable calculus, differential equations, and sequences/series thoroughly.
• Abstract algebra: Indian students from applied mathematics backgrounds may have gaps in abstract algebra (group theory, ring theory). If you have not taken a dedicated abstract algebra course, study the basics: definitions of groups, subgroups, cyclic groups, ring axioms, and homomorphisms.
• Time management: 66 questions in 170 minutes means approximately 2.5 minutes per question. However, many questions can be solved in under a minute if you recognise the pattern. Save time on easy questions to invest in harder ones.

Target Scores

• Top 10 maths PhD programmes: 880+ (90th percentile)
• Top 10-30 programmes: 780-880 (70th-90th percentile)
• Top 30-50 programmes: 680-780 (50th-70th percentile)

GRE Psychology Subject Test

The Psychology GRE tests knowledge across the full spectrum of undergraduate psychology. It is less commonly required than the Physics or Maths tests but can strengthen applications to clinical, cognitive, or research-oriented psychology PhD programmes.

Format

• 205 five-choice multiple choice questions
• 170 minutes
• Covers biological bases of behaviour, cognitive psychology, social psychology, developmental psychology, clinical and abnormal psychology, measurement and methodology

Content Breakdown

• Biological (17-21%): Sensation, perception, neuropsychology, ethology, comparative psychology, psychopharmacology
• Cognitive (17-24%): Learning, memory, thinking, language, attention
• Social (12-14%): Social perception, attitudes, interpersonal attraction, conformity, aggression
• Developmental (12-14%): Theories of development, cognitive development, social development, ageing
• Clinical (15-19%): Psychological disorders, assessment, treatment, personality theories
• Measurement and methodology (2-4%): Research design, statistics, psychometrics

Preparation for Indian Students

Indian students with a BA/BSc in Psychology from strong programmes typically have adequate content knowledge but may have gaps in specific areas emphasised by the American psychological tradition. Use a comprehensive introductory psychology textbook (Myers' "Psychology" or Nolen-Hoeksema's "Atkinson and Hilgard's Introduction to Psychology") as your primary review resource. ETS provides a practice test for the Psychology Subject Test -- use it to identify your content gaps.

General Preparation Tips for All GRE Subject Tests

• Start early: GRE Subject Tests require 3-4 months of preparation for most Indian students. The breadth of content means you need sustained review over time, not last-minute cramming.
• Use the ETS practice test first as a diagnostic: Before beginning preparation, take the free ETS practice test to establish your baseline. This reveals which topics you already know and which need review.
• Focus on speed: Subject Tests have intense time pressure. Practice solving problems quickly -- dimensional analysis, estimation, elimination, and pattern recognition are as important as deep understanding.
• Understand the scoring: There is no penalty for wrong answers on the current GRE Subject Tests. Answer every question, even if you are guessing. Never leave a question blank.
• Take the test seriously even if it is optional: A strong Subject Test score (80th+ percentile) meaningfully strengthens your application. A weak score (below 50th percentile) can raise concerns. If you are going to take it, prepare properly.

Test Logistics

GRE Subject Tests are administered at Prometric test centres. In India, test centres are available in major cities. The test fee is USD 150 (approximately INR 12,500). Subject Tests are offered only 3 times per year: September, October, and April. This limited schedule means you need to plan ahead -- if you miss a test date, you may wait months for the next one.

Register through ETS at ets.org/gre. Scores are available approximately 5-6 weeks after the test date. You can send scores to up to 4 graduate programmes for free at registration.

Should You Take a GRE Subject Test? The Bottom Line

For Indian students applying to PhD programmes in physics or mathematics at top US universities, the GRE Subject Test is effectively mandatory. Even at programmes where it is listed as "optional" or "recommended," having a strong score signals depth of knowledge and seriousness of preparation. For Master's programmes, engineering, or other fields, the Subject Test is usually unnecessary.

The Subject Test is most valuable when it adds information that your transcript does not convey. If you graduated from a well-known Indian institution (IIT, IISER, ISI, CMI) with strong marks, the Subject Test confirms what your transcript suggests. If you graduated from a less-known institution, a strong Subject Test score can demonstrate that your knowledge is on par with students from top programmes. In either case, the investment of 3-4 months of preparation can significantly strengthen your application for competitive PhD programmes.