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Choosing Subjects at 16: Questions Worth Asking First

Subject choices at sixteen quietly narrow or widen options years later. A few checks now prevent an avoidable dead end.

By Tomas Lindqvist · Reviewed by the StudentPatent education desk

Updated 26 June 2026 · 3 min read · 491 words

Choosing Subjects at 16: Questions Worth Asking First
Some doors close quietly, years before anyone notices.

The decision about which subjects to take after sixteen is made quickly, usually with limited information, and it constrains university and career options more than most students realise at the time.

It is not irreversible, but reversing it costs a year. A few hours of research now is a good trade.

The prerequisite trap

Certain degrees have hard subject requirements. Miss one and the door is closed regardless of grades.

  • Medicine, dentistry and veterinary science: chemistry almost universally, biology usually.
  • Engineering and physics: maths essential, further maths often expected at competitive institutions.
  • Economics: many strong departments require maths.
  • Psychology: often counted as a science, but check whether a specific science is required.
  • Architecture: portfolio expectations that take months to prepare.

Look up the entry requirements for three or four courses you might plausibly want, on the actual university websites, before choosing. Not a summary article, and not what a friend's older sibling remembers.

Quick tip

Requirements change year to year. Read the page for the year you would enter, not last year's.

Questions worth answering honestly

  1. What do I want to keep open? At sixteen most people do not know what they want to do. The sensible aim is a combination that closes as few doors as possible.
  2. Which subjects do I actually do the work for? Interest predicts effort and effort predicts grades. A subject you find dull will not be rescued by it being strategic.
  3. What am I good at, based on evidence? Not what you enjoy in the moment, but where the marks have been for two years.
  4. Does this combination hang together? Groups that share skills reinforce each other. Three essay subjects or three quantitative ones each build a coherent skill set.
  5. Who teaches it and how is it assessed? Coursework-heavy versus exam-heavy suits different people substantially.
Key point

Choosing a subject because it is thought to be easy is the most common regret students report. The easy subject is rarely easy and often less respected.

The maths question

If there is any chance of a quantitative degree, economics, psychology, computer science, sciences, business or finance, keep maths. It is the single most frequently regretted omission, and it is the hardest to add later because it depends on continuous prior content.

Talking to the right people

  • Subject teachers know what the course is really like and how much content lies ahead.
  • Careers advisers know entry requirements and admissions cycles.
  • Current students one or two years ahead know the workload honestly.
  • People doing the job can tell you which parts of the path actually mattered.

If you get it wrong

Options exist. Some schools allow a switch in the first few weeks. Foundation years exist for students missing a science. Access courses, conversion degrees and apprenticeships all provide routes back. It costs time rather than possibility, so decide with care but not with dread.

The choice matters. It does not determine your life.

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