Last lap to D-day...!!!

Last lap to the D-day and am a lil apprehensive to the whole thing. I have been doin the OG11 and the 800.com tests over the last 3 months. Recently i had taken the test prep only to realize am scoring just around 550(Q-38, V-29) on the same. Need some help guys on how to crack the same over a 30 da...