The best study materials for GRE preparation include a mix of official resources and trusted third-party books. The Official Guide to the GRE® General Test by ETS is essential, as it offers real test questions with detailed explanations, providing a clear understanding of the test structure and question types. Additionally, Kaplan GRE Prep Plus and The Princeton Review GRE Premium Prep are highly recommended for their extensive practice questions and strategic study techniques, helping you build confidence in both the verbal and quantitative sections. Manhattan Prep’s 5 lb. Book of GRE Practice Problems is ideal for in-depth practice with over 1,800 questions, particularly useful for those focusing on rigorous problem-solving. For those seeking a more affordable option, Magoosh GRE Prep Book offers great value with clear explanations and study schedules. Supplementing these resources with online platforms like GregMat for verbal reasoning or Kaplan's free GRE resources can provide extra practice and flexibility. Combining these materials will give you a balanced approach to mastering the GRE.