Should I cram for Rd 1 or postpone my application to Rd 2?

Hi all, I have a 740 GMAT score and submitting applications for Harvard, Stanford, MIT, and UPenn. I felt very good about my Harvard application for Round 1 (I have already submitted it); however, I feel very uneasy about the Stanford, MIT, and UPenn applications. I haven't had much time to focus on...