This depends heavily on the adaptive nature of the test. Having surveyed a massive number of the posts here in my prep for the test and having taken it myself (68 OAR, although I think math was my weakest section) some posts on content are directly contradictory but likely were both true for the tests of both posters. For example I saw some posts saying that you needed to know matrix multiplication and exponents, and others saying they had gotten out of the test without having seen either - I got matrix multiplication and exponents, and judging on where they were during my test I got them because I had answered correctly on previous questions. You should do some reading of test post-mortems in this thread and prepare for most problem types you see mentioned across all of them instead of focusing on any one type so you can answer whatever the adaptive test throws at you.