Why the GRE
The Graduate Record Exam (GRE) is the preferred test worldwide for STEM grads and also favored by many non-STEM grads. The GRE test is a test of Verbal Reasoning, Quantitative Reasoning and Analytical Writing and used for grad entry into many MS, MA, M.Phil, PHD and MBA programs.
STEM programs in top US universities mostly require the GRE. STEM grads in the USA and internationally often take the GRE test to bolster their profiles and stay competitive.
A STEM grad program at a top university in the USA is the holy grail for many domestic and international students given the strong employment and career prospects for STEM.
See USA median wages and growth prospects for STEM grads