You can read all the rules and learn all the strategies you want, but the best way to get good at taking standardized tests is by doing practice questions. The more, the better.
This section is divided into three areas: Vocabulary, Math, and Writing. The Vocabulary area has sentence completion questions. You know how to do those: insert the word that best completes the sentence. The Math area includes SAT-style questions in algebra, geometry, statistics, probability, data analysis, and operations. Most of these will be multiple choice, but a few are student-produced responses. The Writing area has some questions that ask you to identify an error (if there is one), and others that want you to correct the error (again, if there is one).