Over-Rated

Studying is over-rated.....6 years ago I studied 1 hour for every hour of class - I got good grades. This year I studied far less - I got good grades. Now I have the most important test of all - the test that trumps all others tests, for if I fail this test all others were passed in vain. However, my brain has learned "studying is over-rated" so now it refuses to study. No doubt i've tried....tried and failed. 
Thanks brain - don't let me down now, just one more good grade, I promise!