Preparing for the GRE Math Subject Test requires a solid understanding of key mathematical concepts, particularly Calculus (I-III and Differential Equations) and Algebra, which are emphasized as easier sections to master. The "Other Topics" section, which includes Probability, Statistics, Real Analysis, Topology, and Complex Analysis, is noted as more challenging. There are limited official practice tests available, with only a few old exams from ETS being recommended for preparation. It's advised to focus on practicing with these exams and to identify and strengthen any weak areas in foundational knowledge. For those considering when to take the test, earlier attempts may be beneficial, as the content is primarily based on undergraduate material rather than advanced graduate coursework. Multiple attempts at the GRE are generally acceptable, provided that scores improve, as schools typically consider the highest score. Resources such as specific books and websites can aid in preparation, although the availability of materials is less extensive compared to other subjects.