I'd show some more examples. Maybe a full page. That's only 3% of your total product so I think its ok giving that away for free.

Your payment page is a redirect nightmare. It uses some click tracker on your site, to some url shortener, to a site called 'payloadz', and then finally to paypal. I would build/brand your own payment page.

More testimonials with actual people and actual results. Think along the lines of:

I scored an XYZ on the MCAT because of this.

and

I was averaging a C and aced the final because of this.