GRE Subject Tests, explained
Most people preparing for the GRE only need the GRE General Test. The GRE Subject Tests are a separate, optional set of exams that measure undergraduate-level knowledge in one specific field, taken only by applicants to certain graduate programs in that subject. There is an important catch in 2026: only three Subject Tests still exist (Mathematics, Physics, and Psychology), because the others have been discontinued. Here is what they are, who actually needs one, and how they differ from the General Test most applicants take.
What the GRE Subject Tests are
A GRE Subject Test measures your knowledge of a single academic field at the undergraduate level. It is separate from, and additional to, the GRE General Test, which tests broad verbal, quantitative, and analytical writing skills. Where the General Test is accepted across most graduate fields, a Subject Test is field-specific: a physics department, for example, may want to see how strong your physics foundation is beyond your transcript.
They are taken by a much smaller group of applicants, usually those applying to competitive research or PhD programs in the relevant subject. If you are applying to a typical master's program, an MBA, or most graduate programs, you almost certainly do not need one.
The three Subject Tests offered today
As of 2026, ETS offers three GRE Subject Tests (always confirm the current list on ets.org):
- Mathematics. Covers calculus and the core undergraduate math major (algebra, real analysis, and additional topics). Aimed at applicants to graduate math and some quantitative programs.
- Physics. Covers the undergraduate physics curriculum, including classical mechanics, electromagnetism, quantum mechanics, thermodynamics, and more. Common for physics PhD applicants.
- Psychology. Covers the breadth of an undergraduate psychology program, including biological, cognitive, social, and developmental areas. Used by some psychology graduate programs.
Each is a single-subject test, far narrower and deeper than the General Test, and you only sit the one that matches your field.
Which Subject Tests were discontinued
This is where a lot of outdated advice trips people up. ETS has retired several Subject Tests over the years, including Biology, Chemistry, Literature in English, and the Biochemistry, Cell and Molecular Biology test. If a guide or forum points you to one of these, it is out of date.
If your field no longer has a Subject Test, programs simply rely on your transcript, the General Test, research experience, and recommendations instead. Confirm what currently exists and what your program expects on ets.organd the program's own admissions page.
Do you actually need a GRE Subject Test?
Usually not. Work through this quickly:
- Check your target programs' admissions pages. Only a minority of programs, mostly competitive PhD programs in math, physics, or psychology, require or recommend the matching Subject Test.
- Note required vs recommended. If it is only recommended, a strong score can help a borderline application, but a weak one can hurt. If it is not mentioned at all, you do not need it.
- Prioritise the General Test. Almost every applicant who needs a GRE at all needs the General Test, so that is where your prep should start. See is the GRE required to check whether you even need a test.
Scoring, dates, and registration
Subject Test scores are reported on their own scale, separate from the 130 to 170 General Test scale, on a range up to 990 (the exact reported range and any subscores vary by test, so confirm the current detail on ets.org). Scores are valid for 5 years, like the General Test.
The Subject Tests are now computer-delivered and offered during testing windows across the year, rather than on the handful of fixed paper dates they used historically. You register through your ETS account. Because availability and the exact windows change, book early and confirm the current schedule on ets.org before you plan around a deadline.
Subject Test vs the GRE General Test
Do not confuse the two. The General Test is the broad, widely required exam, and it is the one our free mock tests and practice are built for. A Subject Test is a separate, optional, field-specific exam on top of it, needed only by a small set of applicants.
If you are still gauging the General Test, start with how hard is the GRE and a free full-length mock, then only add a Subject Test if a target program specifically asks for it.