Radcliffe Camera, University of Oxford. Tejvan Pettinger, Flickr

The entrance exam for All Souls College at Oxford University has been called the world's hardest test.

That's because it's nearly impossible to revise for. The questions are abstract and there are no right or wrong answers.

The prize is a 7-year fellowship at Oxford University, which typically goes to two students each year. Only about a one-twentieth of applicants make it to the end.



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