I used to administer aviation written tests. Good suggestion on moving on if you're stumped. My other suggestion was when you come to a question requiring math...bypass it initially. Mark it on the side of the answer sheet & come back later. Otherwise you are liable to get bogged down with math & frustration may cause you to miss questions following the math question. BUT, don't forget to come back to it.

When you have math questions, read carefully to be sure you know what they're wanting you to solve for. Otherwise you may waste time working towards the right answer for the wrong question.

Do NOT leave any questions unanswered. After you think you're done, verify that you answered all of the questions.

I'd say when "All of the above" is offered as a possible answer, that's usually the winner.