What are some things you wish you knew going into senior year?

May be very general, but just looking for advice covering anything and everything you have to offer us poor applicants!

There’s already a pretty solid thread about this: http://talk.collegeconfidential.com/admissions-hindsight-lessons-learned/1463929-what-are-some-things-you-wish-you-learned-about-college-college-admission-process.html#latest