Choosing Your ESAT Modules: Official Combinations for Cambridge, Oxford, Imperial and UCL

The ESAT has five modules: Mathematics 1, Biology, Chemistry, Physics and Mathematics 2. The core rule is short: every candidate sits Mathematics 1, and most courses require two further modules, making three in total. Each module lasts 40 minutes and contains 27 multiple-choice questions; modules are separately timed, spare time does not carry over, there are no breaks between modules, and the whole test runs to 120 minutes for most candidates.

A second rule matters just as much for module choice: the official specification states that every module assumes knowledge of the Mathematics 1 content. Biology, Chemistry and Physics questions draw on their subject topics plus that mathematical base, while Mathematics 2 builds further maths on top of it. So the real question is not simply which two modules to add, but which two subjects you want to stack on the compulsory mathematical foundation.

Scoring follows the same module-by-module logic: each module you sit is reported separately on a scale from 1 (low) to 9 (high) to one decimal place, and there is no combined total. Universities look at your performance in the specific modules their course requires, so sitting the wrong ones cannot be papered over with a high score elsewhere.

A surprising amount of online advice treats ESAT modules as a free personal choice, and that is the first misconception to clear. Officially, some courses specify exactly which modules you must take, and UAT-UK tells candidates to check the university webpages for each chosen course carefully. The authoritative document is the Course List that UAT-UK publishes for each admissions cycle; the 2027 entry edition sets out, course by course, which test is required and which modules.

Requirements come in two patterns. Some courses fix the combination outright: Cambridge Engineering, for instance, names Mathematics 1, Mathematics 2 and Physics with no alternatives. Others give a constrained free choice, written as Mathematics 1 plus any two modules chosen from Biology, Chemistry, Physics and Mathematics 2. Working out which pattern applies to every course on your UCAS list is step one of the whole decision. If all your courses are fixed, the tables below settle the matter; if any offer a free choice, the later section on choosing by strength applies.

Mind the validity window too: the current content specification covers the October 2026 and January 2027 sittings, so rely on the current cycle's Course List and departmental pages rather than a forum post from a previous year.

Cambridge has four courses requiring the ESAT for 2027 entry, and they split cleanly into two patterns:

Two things deserve attention. First, Engineering (H100) is the only fixed combination of the four: Mathematics 1, Mathematics 2 and Physics, with no substitutions. Second, for the other three courses the choice pool contains all four optional modules, and Mathematics 2 is explicitly on the list. Plenty of unofficial guides assume Natural Sciences applicants must pick two of the three sciences; that quietly shrinks the pool. For a mathematically strong applicant leaning towards the physical side of Natural Sciences, Physics plus Mathematics 2 is a perfectly legitimate official combination. The same applies to Veterinary Medicine and to Chemical Engineering and Biotechnology: the official Course List does not narrow their options.

Oxford's ESAT courses for 2027 entry are strikingly uniform:

With the single exception of Biomedical Sciences, every Oxford ESAT course fixes the same combination: Mathematics 1, Mathematics 2 and Physics. Applicants to Oxford's engineering and physics routes therefore have no module decision to make at all; the preparation list is settled the day the application is. The Course List also carries with Foundation Year variants of several courses, so find the exact line for your own course rather than assuming it matches the standard entry.

One further Oxford-specific constraint sits outside module choice but shapes planning: most Oxford applicants must sit the test in October, with the January exception applying to routes with January admissions deadlines such as the Astrophoria Foundation Year. Details are in the booking section below.

Imperial publishes its requirements by department, and eight departments require the ESAT:

Three observations. First, five of the eight departments (Aeronautics, Civil and Environmental, Electrical and Electronic, Mechanical, Physics) converge on Mathematics 1 + Mathematics 2 + Physics, the single most common fixed combination across all four universities. Second, the two chemistry-and-life-science routes break the pattern: Chemical Engineering swaps Physics for Chemistry, and Life Sciences drops Mathematics 2 entirely in favour of Chemistry plus Biology. Third, the Dyson School of Design Engineering is the case the Course List singles out: it marks MEng Design Engineering (28G3) as requiring two modules only, Mathematics 1 and Mathematics 2, so its candidates sit two 40-minute modules rather than the three-module, 120-minute test most candidates take.

Imperial also states that you sit the ESAT once per application cycle, in October or January as you prefer, and that only your first score is considered; if Cambridge or Oxford is also on your list, however, October is required.

UCL joins the ESAT list from 2027 entry. From September 2027 entry (or September 2028 deferred entry), applicants to its Electronic and Electrical Engineering undergraduate programmes (BEng/MEng) must take the ESAT: three modules, namely Mathematics 1 plus any two of Mathematics 2, Physics, Chemistry and Biology. UCL accepts either sitting, October or January.

Note the wording: UCL is an any-two course. If your UCAS list also contains a fixed-module course, the clash rule in the next section says the fixed course dictates your selection. Conveniently, the most common fixed combination, Mathematics 1 + Mathematics 2 + Physics as required by Imperial's Electrical and Electronic Engineering among others, also satisfies UCL's requirement. Applicants targeting UCL alone get the full benefit of the choice-by-strength method later in this guide.

Buried in the notes of the Course List 2027 Entry is the rule this article most wants you to know, because it invalidates applications quietly. When you apply to two or more courses that require the ESAT and at least one of them offers a free choice of modules, your selection must follow the courses that list compulsory modules. Register without a course's compulsory modules and your application to that course may be treated as invalid.

Worked examples built from the official requirements:

If every ESAT course on your list offers the free choice (say, Cambridge Natural Sciences plus UCL Electronic and Electrical Engineering), the decision genuinely returns to you. Officially there is one framing statement about difficulty: the test is deliberately challenging, designed to differentiate between able applicants including those with the highest possible school grades. The practical inference is that with a free choice, your score matters more than whether a subject looks the part, so sit the two modules where you can perform best.

A concrete method:

Module choice is executed at booking, and the system is unforgiving. Your selected modules cannot be changed afterwards; the only route is cancelling the test and re-booking. You may sit each UAT-UK test only once per admissions cycle, and the 2027 entry cycle spans both the October 2026 and January 2027 sittings; any attempt at a second registration, including under a second account, is treated as misconduct.

The windows are worth memorising: booking for the October sitting opens on 20 July 2026 at 3pm UK time and closes on 28 September at 6pm; the January window runs from 26 October at 3pm to 21 December at 6pm. Most Cambridge and Oxford applicants must sit in October; the exceptions the official deadlines page names are mature applicants to Cambridge mature colleges with a January admissions deadline and Oxford's Astrophoria Foundation Year. Applicants to other institutions may choose either sitting, and officially neither carries an advantage.

Candidates testing in mainland China, Hong Kong or Macau should note the restricted days: the ESAT runs there only on 12 or 13 October and on 6 January. The fee is £78 at UK and Republic of Ireland test centres and £133 elsewhere, set by test centre location rather than nationality or residence. Results follow roughly four weeks after the test, on 16 November 2026 and 8 February 2027 for the two sittings, and are sent automatically to the institutions whose courses require the test.

First, the seven-university claim. UAT-UK does state that seven UK universities use one or more of its tests, but that figure counts all three tests (ESAT, TMUA and TARA) together. Work through the Course List 2027 and the courses listed under Durham, LSE and Warwick use the TMUA; UAT-UK's own ESAT page names Imperial College London, the University of Cambridge, the University of Oxford and UCL as the ESAT universities. Some university pages blend the member list into an ESAT list; where lists disagree, follow UAT-UK and the Course List.

Second, the keep-options-open plan of booking now and changing modules later. That route does not exist: the selection is final short of a full cancellation and re-booking, and once the booking window closes even that option is gone.

Third, thinking in totals. There is no overall ESAT score; each module is reported separately on the 1 to 9 scale, results are matched course by course against your UCAS application and sent automatically to the institutions that require the test, and you cannot choose who sees them. The entire point of module choice is making sure the modules a course demands are the ones that appear on your result, at the level you are most confident of producing. That is exactly why the decision deserves this much attention before booking rather than after.