crushgre

A score of 305 would put you at the 50th percentile. So for a competitive program at Vanderbilt you'll want to shoot for the 80th percentile range of at least 315

A "good score" is subjective to the schools you want to get into and the specific program within that University. There's a solid breakdown of GRE cutoff scores you can check out to see what your schools are looking for to AT LEAST consider your application. Once you hit a school's benchmark score, they'll look at your score relative to other applicants and they'll look at other factors including your GPA. This is why I always recommend you shoot for a goal 10 pts higher than your target school's cutoff score. Hope that helps. Best of luck!