A-levels (short for Advanced Levels) are the main academic qualifications taken by 16-to-18-year-olds in the UK, studied over two years in what’s known as Year 12 and Year 13. They serve as the primary gateway to university admission and are roughly equivalent to what other countries call a high school diploma, though they go much deeper into fewer subjects.
How A-Levels Work
Unlike education systems where you study a broad range of subjects right up to graduation, A-levels narrow your focus. You typically choose three or four subjects and spend two full years studying them in depth. This specialization is intentional: universities in the UK expect applicants to arrive with strong preparation in the subjects related to their degree.
Most students begin A-levels after completing their GCSEs (General Certificates of Secondary Education), which are the exams taken at age 16 covering a wide spread of subjects. To start A-levels, you generally need at least five GCSEs at grades 4 to 9, with passing grades in English and Maths typically required.
Choosing Your Subjects
Subject choice matters more than quantity. University offers are usually based on three A-levels taken together in Year 13, and taking a fourth doesn’t normally give you an advantage. The exception is competitive STEM courses, where strong applicants often study Further Mathematics as a fourth subject.
The range of available subjects is broad: English Literature, History, Mathematics, Physics, Chemistry, Biology, Economics, Geography, Psychology, modern and classical languages, Philosophy, Politics, Religious Studies, Music, and many more. What you pick should align with what you want to study at university, since many degree programs expect or require specific A-levels.
For science and maths-oriented university courses, the core A-level choices are Biology, Chemistry, Physics, Mathematics, and Further Mathematics. Chemistry is particularly important if you’re aiming for medicine, biological sciences, or chemical engineering. Further Mathematics is essential for a university maths or computer science degree and very useful for engineering and economics.
For arts, humanities, and social sciences, universities like to see subjects such as English Literature, History, a language (French, German, Spanish, Latin), and Mathematics. Maths is considered useful even for non-STEM courses like law and economics.
Some A-level subjects carry less weight with selective universities. Vocational or career-focused A-levels like Business, Health, Photography, Performing Arts, Travel and Tourism, Physical Education, and Media Studies are generally seen as weaker choices if you’re applying to highly competitive institutions. A-level Critical Thinking and Key Skills are not counted as a full A-level by some universities, though they can work as an extra fourth subject.
How You’re Assessed
A-levels follow a linear assessment model, meaning you take all your exams at the end of the two-year course rather than in modules along the way. This gives more time for teaching and learning during the course itself, but it also means everything rides on your final exams. Some subjects include coursework that you complete during the course, but it isn’t externally assessed or moderated until the end.
If you don’t get the grade you need, you can’t resit individual exam papers. You’d have to retake all the papers for the entire subject at a later sitting.
The Grading Scale
A-levels are graded on a letter scale: A*, A, B, C, D, and E are all passing grades, while U means “ungraded” (a fail). University offers are typically expressed as a combination of grades across your three subjects. A competitive offer from a top university might ask for A*AA, while less selective courses might require BBB or BCC. These grades are converted into UCAS points (the university admissions system’s numerical scale) to standardize comparisons across different qualifications.
AS-Levels: The First-Year Option
AS-levels (Advanced Subsidiary) cover roughly the first year of A-level content. They used to be the compulsory first half of an A-level, but since reforms they’ve become a standalone qualification. Some students take four subjects in Year 12, sit an AS-level exam in one of them, and then continue with three subjects into Year 13 for full A-levels. AS-levels carry UCAS points but are worth less than a full A-level, and many universities place little weight on them in admissions decisions.
How A-Levels Compare to T-Levels
T-levels are a newer alternative introduced for students who want a more vocational, hands-on route. Where A-levels are theoretical and academic, focused on subject knowledge and critical thinking, T-levels are designed around trade and industry skills with the goal of preparing students for work in a specific field.
The structure is quite different. With A-levels you study three or four subjects; with a T-level you focus on a single subject exclusively for two years. T-levels also require a 45-day industry placement (unpaid work experience in a relevant workplace), which counts for 20% of your final grade. One completed T-level is worth the UCAS points equivalent of three A-levels.
The trade-off is university acceptance. While T-levels open doors to many universities, some institutions, including Oxford, Cambridge, and several other Russell Group universities, do not accept them. If you’re targeting highly selective universities, A-levels remain the safer choice. If you’re more interested in entering a specific industry or pursuing an apprenticeship, T-levels offer practical experience that A-levels don’t.
Where A-Levels Lead
The most common next step after A-levels is university. Your grades determine which courses and institutions you can apply to through UCAS, the centralized admissions service. Applications are submitted during Year 13, often before you’ve sat your final exams, so universities make “conditional offers” based on predicted grades. If your results meet the conditions, your place is confirmed.
A-levels aren’t only a university ticket, though. They’re widely recognized by employers and can qualify you for higher-level apprenticeships, which combine work with study and lead to professional qualifications. Some students also use A-levels to apply to universities outside the UK, where the qualification is generally well understood and respected.