I know that I would need to get ~39 answers right, so what topics should I focus on for practice/study?
The answer to this question is not the same for everyone. You need to work on your weak areas. These are specific to YOU.
If you don’t know which parts of the math are giving you trouble. complete the two math sections of an official practice test under simulated test conditions.
If you are able to identify the specific question types that are giving you trouble, concentrate on those.