You must know the right time to take the GRE test so that there’s no delay in the process. Experts suggest students take the GRE test in their penultimate year. So, if you are planning to pursue your Master's abroad, sit for GRE in the second last year of college. You will have time to rectify the mistakes and work on them before it's too late. Also, you can sit for the test again if you fail to make it in the first attempt.