Some questions on the SAT are rather hard. Most test takers should skip these questions. We'll talk about how to identify hard questions as we come to them. Often students become obsessed with a particular problem and waste valuable time trying to sovle it. To get a top score, learn to cut your losses and move on.
All questions are worth the same number of points, regardless of difficulty level.
So skip the hardest questions and concentrate on the easy and medium ones. Although there is a small guessing penalty on the SAT, if you can eliminate even one of the answer-choices, it is to your advantage to guess. Like most standardized tests, the SAT lists problems in ascending order of difficulty. Therefore, when trying to decide which questions to skip, skip the last ones. Each SAT section has subsections.