ECs good. Grades alright, interpretation of class rank probably depends on how the Vanderbilt admissions office thinks about your school (i.e. in recent history, what kind/how many students from your school got accepted to Vanderbilt? Just kids at the top, or people at your rank range as well?). Test scores alright, it would help if you bumped up the ACT to a 33 or 34. You can probably squeeze out a couple more points on the math section with more memorization/study of material in any prep book, and the science section is just practice with the red book, not much study you can do. I’d say you still have a chance with your app as it is now though, it will just depend on how everything is subjectively interpreted, so do some good work on your essays/get good recs.