Hey there, @Kaust_applicant
I am a current BS senior student, CGPA: 3.5/4.0
TOEFL IBT 92
Math interview was about 40-50 minutes, about 15-20 questions regarding calculus, statistics and probability and a lot on linear algebra. Some of them were to solve the problems, some on definitions, some tricky questions as well. I hope it helps you and everyone.
I am really sure that they consider things beyond grades and scores, and I think that the hugest part of the admission is the personal interview which I haven't passed yet.