Prepare yourself for to study... a lot of studying to say the least.
The GRE, GMAT, LSAT, and MCAT are huge factors in the admissions process and if you want to get into a good school, you better get a high score.
High scores = getting into a top school = typically a higher salary than if you graduate from an "average" school.
That's just the facts.
I brought Mike Bergin and Amy Seely (the co-hosts of the Tests and the Rest podcast) on to share their insights into how to best prepare for these exams!