Well, virgin as virgin can get here, but I thought I'd chime in on the part I can help on.

Decreasing anxiety is, I think, a huge factor in helping. You can't be expected to perform well if you're nervous, be it a test or sex (though no...lol you don't have to get an A, or even necessarily pass 100% of the time. ). Try to relax...I know easier said than done, but that, I think, will prove a huge boon.