Do you know all that you need to about the GMAT and GRE? Many b-school-bound students are scratching their heads over the similarities and differences, as well as school preferences for both exams. Thankfully, most MBA programs now accept either test for admittance, but that still doesn't answer a lot of important questions. We fill you in on all you need to know, spanning topics such as cost, verbal and quant differences, and scoring.