The reading section requires you to complete sentences and answer questions after reading selections. Knowing appropriate sentence structures helps with this portion. Read the selections quickly to get a general idea and only reread for specifics if necessary. The writing section requires you to pick out grammar errors and change sentences or paragraphs to improve them. The goal of the writing section is to pick out the sentences and paragraphs that flow the smoothest. Read over the choices in your head and make sure to pick one that uses the most direct path to conveying its point. This section also requires a strong knowledge of appropriate sentence structure.
The math section is divided into a multiple-choice section and a grid section where you must work out and write your own answers. Skip over the questions that use forms of math you are less familiar with and come back to them. Make sure to get to all of the questions you know you can answer correctly first. If you are having trouble with a multiple choice question, check to see which answer makes sense in the context of the problem presented.
Make sure never to leave any math grid question answers blank, as incorrect answers do not carry additional weight. Try all of the practice materials you can to ensure you understand what the test will be like. There are plenty of practice tests online and you can even try out questions from previous versions of the exam. Look over all of the potential answers before selecting one just in case there is a better solution than the one you are thinking of marking. If you wind up with extra time, go back over questions you were not sure of when you answered them.