Admissions tests for Oxford take place around the 5th November each year. They are used as part of the selection process. But don’t panic,there are plenty of practice papers available.
Click on the link for everything you wanted to know about Oxford’s Admission Test, including which subjects require you to take them.
After you have taken the test they are marked by an external agency and the results are passed on to the university and in some cases to you and your school.