First, they will send you an apt test link, and you have to solve 10+ questions in a short period of time. The questions are mainly about combinatorics. They are not very hard if there is no time limit, but there is. Then, you will receive an phone interview, which consist of some math problems and some behavoral. The difficulties of the questions is easier than the apt test but you have to deliver your idea clearly.

I did the OA, I think I made a 16/17 correctness. But No response since. My classmates received a exact rejection. I suspect they have a pool of pending, but I didn't try to proceed.