Studying for the GRE varies significantly among test-takers, with many suggesting a dedicated preparation period, often spanning a summer. Key resources include the free GRE POWERPREP program, which offers sample questions, practice tests, and tips on test format and timing. Familiarity with the types of essay questions is crucial, as practice essays can help improve writing skills tailored to GRE expectations. While some individuals report success with minimal study, particularly in the verbal and math sections, the Physics Subject Test requires more extensive preparation, often recommended at three months or more, focusing on both theory and problem-solving. It's noted that some graduate programs may not heavily weigh the essay portion of the GRE, but strong writing skills remain important for academic success. Overall, consistent practice with sample problems and understanding the test structure are emphasized as effective strategies for GRE preparation.