Test of Mathematics for University Admission (TMUA), Sixth Term Examination Paper (STEP); 2x interviews
Maths questions
Mock interviews and practice questions
Practice talking about your subject and try not to stress
Remember this advice isn't official. There is no guarantee it will reflect your experience because university applications can change between years. Check the official Cambridge and Oxford websites for more accurate information on this year's application format and the required tests.
Also, someone else's experience may not reflect your own. Most interviews are more like conversations than tests and like, any conversation, they are quite interactive.
Test taken: Test of Mathematics for University Admission (TMUA), Sixth Term Examination Paper (STEP)
Number of interviews: 2
Time between interviews: 2 hrs
Length of interviews: 1 hr
Online interview: Yes
Just discussing maths questions in both
Don't stress it, practice talking about your subject fluently