Thousands of teenagers across England, Wales and Northern Ireland are receiving their A and AS-level results. There have been some changes to A-level qualifications recently - the BBC News website sets them out.
What changes have there been to A-levels in England?
New AS and A-level syllabuses have been phased in across schools in England since September 2015.
The change was brought in by the then education secretary Michael Gove with the intention of making the exams more "fit for purpose" - in other words, harder.
Under the new system, students sit all A-level exams at the end of two years of study, instead of taking modular exams throughout the course, as they had done in previous years.
AS-level results no longer count towards A-level grades and levels of coursework have been reduced, with most courses assessed entirely through exams.
Resits will still be available, but January exams have been scrapped, so students will have to wait until May/June of the following year for a chance to improve their grades.