The LSAT really is just practice, practice, practice. You should take at least 10 diagnostic tests before your exam day. The more familiar with the material, the better you will handle curveballs on the exam.
There's also the element of stress and well-being. When I took the exam, this was the hardest part for me to manage. It's important to give yourself time to have fun, eat well, get plenty of rest, and just let your mind take a break.
In terms of resume, I know that law schools not only look for well-rounded applicants, but those who show they are passionate about something. If you are fresh out of college looking to apply immediately, admissions will also be looking to see if you have the mental maturity to thrive in law school, so keep that in mind during your application.