A solid command of English grammar is a prerequisite for success when students take the SAT, ACT, and other college entrance tests. This workbook presents a detailed grammar review with dozens of practice quizzes and exercises to sharpen students' skills. It begins with an explanation of grammatical terms and their functions. It then describes the 24 most common mistakes made by students and shows how to avoid them. Prominent among them are lack of agreement between subject and verb, misuse of pronouns, faulty parallel structure, and faulty punctuation. A final chapter focuses on advice and instruction for writing error-free SAT and ACT essays. This workbook is filled with sample questions exactly like those found on both the SAT and ACT, and comes with fully explained answers.