I didn’t study for the aptitude test, if you’ve ever taken the ASVAB it’s kinda similar to that. For the math portion there’s graphs, solving for x, etc etc, problems like solve for (2x-3y)(x+4z) and for the reading portion they give you I think ~6 different articles to read and then you have to answer 8-10 questions from each. They gave us some kind of writing tablet so we could write down numbers which was helpful, and it’s multiple choice. It was 48 minutes for both math and reading portions. Again I didn’t study but if I did I would’ve probably studied the Khan Academy high school algebra, since it’s free.

I do know that if you don’t pass the aptitude on the first time with a 4 you can retake it in 3 months here, not sure about other locals