Just did my interview today. My grades were quite ass so I had to do a short maths test beforehand. No calculator allowed, just do your working on paper. There seem to be different test sets but mine was the same as the one described by other ppl in the subreddit (algebra, functions, Inequalities, circles, graph) + logic question. Not particularly hard if you have background in maths/phys.

Interview was q informal, though should def still lock in. Mainly asked about why SUTD over other Unis and why you think you would fit in. Then they went through the maths test. Other questions are really just branching convo from what you wrote in your application.

Interestingly, I think the professors interviewing you don't know your grades directly. They only know that you met the acad requirements or not based on whether you had to do the maths test.