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Confused about how your AS-level and A-level studies are structured? We clear up what you'll study (and when)

By Monica Hudson (content creator, The Uni Guide) | 23 December 2025 | 6 minutes read
An ‘advanced level’ or A-level is a qualification available across a range of subjects to school-leavers – graded A*-E.
A-levels are usually studied across two years: Year 12 and Year 13. Some students may take an AS-level in Year 12, but in England this is a stand-alone qualification and not part of the full A-level. You may sometimes hear A-levels being described as 'linear' – this phrase is used to describe the fact that A-level grades are determined by your final exam results at the end of year 13.
The structure of A-levels differs slightly across the UK. This guide mainly reflects how A-levels work in England, with key differences for Wales and Northern Ireland highlighted where relevant.
Visit The Student Room's A-levels forum to see what other students are saying about year 12 and 13.
There are around 80 different subjects available to study at A-level. However, the options available to you will depend on what your school or college offers.
See where your A-level subjects could lead: enter them in our explorer tool
Schools and colleges will often look for at least five GCSEs 9-4 or equivalent.
English, maths and sometimes science are the important subjects to get these grades in – not just when applying to A-levels, but to university and jobs too.
While a 4 is the minimum, higher GCSE grades will leave you in a better position.
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You’ll typically choose three or four subjects to take.
Some students take more subjects, if they’re planning to apply to a competitive university (like Oxford or Cambridge) or course (like medicine or law), for example. Most universities’ A-level entry requirements boil down to three A-level grades.
At the end of Year 12, many students sit internal assessments or exams set by their school or college. Formal exams only take place if you are entered for an AS-level. If you're taking a full A-level, these results won't have any impact on your final grade – although they could help shape your predicted grades.
If you're just taking the subject as an AS-level, this exam will determine your final grade.
(Note: the above only applies in England. In Wales and Northern Ireland, your AS-level marks can still be banked and carried over to count towards 40% of your final A-level grade.)
You’ll continue with your remaining subjects to achieve the full A-level.
At the end of year 13, your all-important exams will decide your final A-level grades. These will test you on content from both years.
Depending on the offers you receive, your A-level grades will determine whether you’ll be heading straight off to uni, going through Clearing or taking a different path altogether.
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This simply refers to the first year of a full A-level.
You can study a subject for one year and achieve an AS-level qualification that’s independent from those subjects you carry on with to the full A-level.
Most students who decide to take an extra AS-level do it in their first year, so they can focus 100% on their A-levels in their second year.
When you decide to continue an AS subject into your A2 year, you’re pursuing it further for the full A-level qualification.
To note: AS-levels can still be useful, particularly for UCAS tariff-based offers or Clearing, but many universities make offers based on full A-levels only.
That AS-level qualification for the subject you’ve dropped is still important in its own way.
Whatever Ucas points this translates to may still contribute to the total points you apply to university with. In England, AS-levels are stand-alone qualifications and do not contribute to the final A-level grade. In Wales and Northern Ireland, AS results can still count towards the full A-level (typically 40%). For example, an A-level A grade is worth 48 Ucas points and an AS-level A grade is worth 20.
Your teachers will also decide your predicted grades based on your AS-level performance in these subjects, which will impact your university application.
Schools and colleges are not legally obliged to offer AS-levels and enter students for the relevant exams, so not everywhere will offer them.
When choosing your A-levels – including whether you want to stay at your school to study them, or go elsewhere – check what options the institution offers.
Yes, you can – this article goes into more detail about taking a Btec with A-levels, including advice from students who've done it about how to juggle the qualifications.
Your decision to study a combination of A-levels and Btecs will depend on a few things, particularly what you plan to do afterwards. While Btecs allow students to acquire practical and vocational skills as part of the course, some universities and courses may have qualification preferences they look for.
They’ll state clearly what they look for in their entry requirements, so if you have your heart set on a certain university or course it's worth checking which qualifications they'll accept before you make any decisions about what to study.
A-levels are primarily assessed by exams, which take place at the end of your second year. You’ll also take exams at the end of your first year, but these won’t count towards your final A-level grades.
Some subjects will be the exception to this, including:
Here are some ideas:
Do you have more questions about this topic? Head over to the A-levels forum on The Student Room.
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