When is the best time to take the GRE? : r/AcademicPsychology
Your GRE scores are valid for 5 years so the only real rule is "Don't take it more than 5 years before you're going to apply to grad school." That being said, I think there's three main factors you want to consider. First, it may be beneficial for you to take it while you're still in undergrad, or shortly after you graduate.