Go through the test and answer the easy questions first. This will earn more points and grant you confidence to move on to the harder questions. The easier questions tend to be towards the fronts of the math and reading sections. If you struggle too long with a particular question, move on and leave it blank. It's better to skip a question and get points for questions you can answer.
On reading questions with two blanks, try solving for the first blank and moving on to the second only if necessary. Double check your answer to make sure both words fit the selected text. If two answers seem correct, reread the sentence and see what word fits better. In comparison questions with words or passages, distinguish in your mind what the difference is before reading the answers. Then read the answers, selecting the choice that best applies to both examples in the question.
Read the directions for the entire section before doing the questions to see what information, such as formulas, will be provided. Use the answers to help you with the questions. For problems you partially know how to solve, look to the answers to find an answer close to what you arrive at. For questions you don't understand at all, look at the answers to see if they point you towards a solution method. Draw geometric figures for geometry problems to help you visualize the solution. Use caution when gridding your answers to avoid losing points due to improper markings.
When inserting a new sentence into a passage, or revising an existing sentence, make sure it flows well with the sentences before and after it. In structure, look for parallels between the segment fragments on either side of conjunctions like "and" or "but." Favor phrases that lack awkward words like "being." Make sure you know to whom, or what, a particular pronoun is referring. When making a comparison, make sure the two things being compared are equivalent.