Failed twice

Hello,

I scored 90% percent on the exam that came with the study material and needless to say I failed. I studied harder and missed it by 3 points the second time. I found a site that helps with self study and have been studying my rear off and I nervous still. On this sites exam test the best I can get is 87%. The NASM exam trainer tell you the correct answer and does offer a lil more info but I'm still nervous, it's costly to retake this exam. I'm going to try this site to help me study and I know I can pass it this time. I have 2 more classes to take through NASM and am anxious to get those going.