Several maths questions during 45 min. Standard greenbook and basic statistics questions, but they care about how fast you are able to solve them. Also mental maths is very important, especially multiplying small numbers.
I interviewed at Susquehanna International Group (Bala Cynwyd, PA)
Interview
The interview process was first a 60 min test and then a 30 min phone interview. I was asked basic behavioral questions for 2 minutes and then 3 problem solving questions.
Typical applied probability and expected value questions over period of a few different stages from online to later on some phone rounds. Quite tough and stressful and I struggled with it
I interviewed at Susquehanna International Group (Sydney)
Interview
Normal OA, applied and was given access to the OA had like a week to do it, revise probability basics: dice rolls, coin flips, conditional probability etc. No individual question limit, able to bounce between 20 questions for the duration of the hour-long test.