Oxford University offers the 'world's hardest test' - here's how to answer the questions

Students applying to Oxford University are interviewed throughout the month of December, so Christmas is a nerve-wracking time for applicants.

As well as being interviewed, prospective students at some Oxford colleges are also required to take entrance exams - and while all of them are notoriously tough, some are even more difficult than others.

The entrance exam for All Souls College at Oxford University has been called the world's hardest test: it's nearly impossible to revise for, the questions are abstract, and there are no right or wrong answers.

Consequently, only a twentieth of the Oxford graduates who take the test are invited to continue the process.

The prize is a 7-year fellowship at Oxford University, which typically goes to two students each year.

Business Insider spoke to someone who both passed their own All Souls exam and now grades them. Our source gave us the inside track on what examiners look for. When you're done, check out all the past exam questions here.

Mike Bird contributed the original reporting to this article.