Very Technical and requires knowledge of calculus combinatorics, basic statistics and mechanics. Interviews mimic the teaching style at the university which are supervisions. This stage simply tests if you are teachable.
I interviewed at University of Cambridge (Cambridge, East of England, England)
Interview
This interview was in person. When you arrive, they put you in a room with the other interviewees. In exam conditions, you answer questions from a paper similar to STEP style. Then you go to the interviewer. After the introductions, the interview is based on the questions you attempted in the test.
Interview questions [1]
Question 1
They asked questions based on the test I just did. Make sure you prepare for the test.