Usually, choose three A-Level subjects that fit your interests and strengths, keep future options open and are available at your sixth form or college. Choose a workload you can sustain. There is no universal list of “best” A-Levels. Make your choice from evidence, not reputation or because your friends chose the same subjects.
Choose a combination that works for you
Think of the decision as choosing the strongest workable combination, not ranking subjects as good or bad. Use five criteria throughout: interest, likely performance, future flexibility, workload and practical availability. A subject you enjoy can still be a poor fit if its assessment style drains you, while a respected subject is not automatically useful for your own plans.
Build a realistic shortlist before making comparisons
Review your GCSE results, current foundations and study habits, but do not treat any one result as a fixed prediction of A-Level success. Look at your work over time, including topics you understand securely and subjects you are prepared to practise independently.
For each possible subject, record the local entry grade, whether it is offered as a full A-Level, and any timetable or subject-combination restrictions. Do this before treating it as a viable option.
- Subjects you enjoy enough to study beyond lessons, including less exciting topics as well as your favourites.
- Subjects where your current classwork, assessments and teacher feedback show secure strengths.
- Subjects whose reading, practice or written work you are willing to continue independently.
- Subjects actually offered by your sixth form or college that you meet the entry conditions for.
Check future routes before dropping a useful subject
Choose several realistic possibilities, not one perfect plan. Include university courses, apprenticeships, technical routes and careers that interest you. Use official course pages and National Careers Service occupation profiles to check typical tasks, qualifications and progression routes. Some careers also require a degree, postgraduate study or a regulated professional qualification, so check the full training route before treating an A-Level choice as decisive. A career title alone does not tell you which A-Levels are needed.
Create a route-check record with these columns: route; institution or provider; compulsory subjects; preferred subjects; grade offer; other selection conditions; and whether each proposed combination restricts eligibility. Keep compulsory subjects separate from preferred subjects. A course may consider applicants without a preferred subject, but that background may make them a weaker fit.
Do not generalise from one course title or one university page. Similar courses can have different expectations. For example, some Computer Science degrees require A-Level Mathematics, while related Business IT courses may not require science beyond GCSE. Check several individual pages before deciding that a subject is unnecessary.
Compare the work each shortlisted subject really involves
Use the specification, the exam board document that sets out content and assessment, and course information for the exact awarding organisation your sixth form or college offers. Assessment arrangements can vary between specifications; compare them with OCR’s non-exam assessment guidance, so broad assumptions such as “this subject is all essays” or “that subject has coursework” are unreliable.
Make one comparison table and use the same headings for every subject: content volume; reading and memorisation; mathematical or analytical demand; practical work; coursework or non-exam assessment, assessed work completed outside final written exams; exam format; extended writing; and independent research. Then add your own notes: Can you manage sustained reading? Do you work accurately in practical tasks? Can you apply knowledge to unfamiliar questions? Are timed essays manageable? If you may complete assessments on screen, consider your reading, typing and extended-writing confidence too.
Test whether each three-subject combination is sustainable
Now compare complete trios, not isolated subjects. Look for duplicated demands, such as several content-heavy sciences, multiple essay-heavy subjects or overlapping practical deadlines. Make sure the mix of exams, coursework and practical work is realistic for you. Check for missing prerequisites, timetable clashes, travel, paid work and other fixed commitments. Ask teachers or sixth-form staff a precise question, such as: “What knowledge or study habit would I need to strengthen before starting this course?”
Try a short, realistic piece of unfamiliar work before relying on a subject label. Read part of a specification topic, attempt a sample question or write a brief response, then record what felt engaging, confusing or slow. If you are unsure where to begin, SimpleStudy topic notes and quizzes can help you choose one topic from a shortlisted subject, read the notes and complete one short quiz. You can also use A-Level revision resources to begin that small trial. Treat the result as evidence for your comparison table, not as a replacement for checking formal requirements or speaking to staff.
Apply the method to a Medicine and Psychology decision
Consider an illustration, not a real student timetable. A student is choosing between Biology, Chemistry, Psychology, Mathematics and English Literature. They enjoy Psychology and are considering Psychology degrees, but they also want to preserve a possible Medicine route. The difficult decision is whether to keep the enjoyable subject while protecting Medicine eligibility.
They check several official Medicine and Psychology course pages relevant to their intended university entry year: King’s College London’s Medicine UCAS course listing, the University of Glasgow’s undergraduate Medicine page, and Queen Mary University of London’s Psychology course page. King’s requires Biology and Chemistry, while Glasgow requires Chemistry plus one of Biology, Physics or Mathematics. Queen Mary requires at least one science A-Level from a stated list that includes Biology, Chemistry, Mathematics and Psychology. This shows why requirements must be checked course by course. Before relying on this illustration, the student must verify the current entry-year page for each route, including admissions-test, interview and GCSE conditions.
Their comparison table records the content and assessment demands of each subject, including reading, practical work, extended writing and independent research. After reviewing GCSE evidence, willingness to study independently, local availability and the combined workload, they choose Chemistry, Biology and Psychology. This keeps the Medicine and Psychology routes they checked open and suits their strengths.
They do not add a fourth A-Level simply to appear more competitive. A fourth subject would add work without changing the core Medicine requirements identified in their research. Mathematics remains a contingency option if the first trio proves unsuitable because of the timetable or workload, rather than being added to an already demanding combination.
Rank the viable combinations and confirm your choice
Eliminate any combination that misses a non-negotiable requirement for a route you genuinely want to preserve. Rank the remaining combinations from one to five for interest, likely performance, future flexibility, workload and practical availability. Scores support judgement rather than produce an automatic answer. Keep one backup combination that is available, manageable and does not close an option you still care about.
Before enrolment, complete this final check:
- Confirm your sixth form or college entry conditions, subject availability and timetable position.
- Recheck official pages for the university courses, apprenticeships or training routes you are seriously considering.
- Complete the comparison table for your two strongest combinations.
- Ask a teacher or sixth-form adviser one specific readiness question, then confirm your choice.
Choose the combination that meets verified requirements and gives you the best chance of sustained, strong work. Keep one workable alternative, confirm the local conditions, and make the decision from evidence rather than reputation, perceived ease or other people’s choices.