Willy,
Rote memorization for the questions is the way to go; however, if you need to ‘understand the question’, grasp a concept on the formula that you could apply. I think you will be surprised come testing time how long it will take you to complete the test. Generally the PAR is the longest I’ve seen because it’s a new format of test, but you have 2.5 hours for testing IF you need it.
A lot of the studying you will do during your flight training (all levels) is self-study, you can ask instructors questions and that’s what they’re for. I would also use my peers if I had a question, sometimes learning from someone in the same phase or ahead of you slightly is beneficial.
Brady