The UK School System:
GCSE, A-Level and IB

Families researching UK schools usually start by comparing A-Level with the IB. It is a reasonable question and it is also the second question. The first is when the child enters, because that decides which qualifications are still available to them.

The structure in one table

GCSEs are graded 9 to 1 in England, with 4 counted as a standard pass and 5 as a strong pass. They are taken at the end of compulsory schooling, but education or training is required until 18, so almost everyone continues.

Sixth Form is what most schools call Years 12 and 13. It can sit inside a secondary school, in a standalone Sixth Form college, or in a further education college.

The four post-16 routes

This is where the real choice is, and there are more options than most families are shown.

• A-Level. Three subjects over two years, assessed by final examination. The dominant academic route for sixty years. Subject choice matters more than the number: Oxford and Cambridge do not require four.
• IB Diploma. Six subjects kept across two years, plus Theory of Knowledge, an Extended Essay and CAS. Suits a strong all-rounder who does not want to narrow early.
• BTEC. Applied and coursework-heavy rather than examination-heavy. Can be combined with A-Levels, and many sixth forms encourage that.
• T-Level. Introduced in 2020, equivalent to three A-Levels at 168 UCAS points, with a 315-hour industry placement. Fewer than 15 per cent of Year 11 students know what one involves.

Entry points, and why they decide the rest

There are three natural entry points into a UK school: Year 7 at eleven, Year 9 at thirteen, and Year 12 at sixteen.

Joining at thirteen gives two years before GCSEs begin, which is time to settle, adjust to the teaching style, and build the language. Joining at sixteen goes straight into Sixth Form, which is academically efficient but compresses the language window into the two years that carry the university application.

There is a middle option that is not widely advertised. Some schools run a one-year intensive GCSE programme in Year 11, designed for international students aged fifteen and above, covering a maximum of six subjects rather than the usual nine to twelve.

What Sixth Form entry actually requires

Most Sixth Forms ask for five GCSEs at Grade 4 or above, with Grade 6 or above in the subjects to be studied at A-Level. Selective independent schools set this considerably higher.

For international applicants there is usually an English requirement as well, commonly between IELTS 5.5 and 7.0 depending on the school. And students who did not reach Grade 4 in GCSE Maths or English must continue studying those subjects alongside their main programme.

International students can take IGCSE, the international version, which is widely offered outside the UK and accepted for Sixth Form entry.

Cost, briefly

State Sixth Form colleges charge international students from around GBP 16,000 a year. Independent boarding schools run from GBP 40,000 and upward, and that figure is before the additional costs that come with boarding.

Sources: published guidance from UK schools and Sixth Form providers, JCQ examination arrangements, and current entry requirements; read September 2026. Grade requirements, fees and available pathways vary by school and change annually. Confirm directly with each institution.

Where I come into this

The question families ask is which qualification is better. The question that decides the outcome is which entry point still works given the child's age now, their English, and the year they would need to apply to university.

Those three fix the shape of everything that follows, and the qualification choice sits inside them rather than above them.