Is it better to spend as much time as necessary (even up to 5 minutes) to solve each problem when I know I can do it (but not necessarily in two minutes), then end up having to do complete guesses on the last 5-7 questions to finish or.... if I take too long on a problem, just fill in an answer, and move on in order to get to every problem in the section.

Sometimes I just get stuck when I know how to attack a problem and I know I'll get the answer right but the computation is taking me a while (i.e. long division, screw up by making a math mistake somewhere along the way, etc.). Hope that question made sense...