Need a little guidance

I already bought my vouchers for the 801 + 802 exam but I still don't think I'm ready. I bought Mike Meyer's A+ book and read through all the pages and did the chapter questions. 32 chapters, 10 questions each, and I hovered around 90%. I popped in the disc accompanying the book and took some of the practice questions but only got 60% which is really low. I took the practice questions on this site (techexams) and I got 34% which is even lower.

Seeing as how I paid 376 dollars for both vouchers I don't want to fail and end up paying again. I'm pretty sure I'm an above average user. I fix all problems on my computer on my own or research on google but the technical stuff is too much to remember. I need some advice on additional study materials or what I can do in order to guarantee a passing grade. I just found out about Professor Messer so I'll be watching the videos the next few nights but what else can I do? Any additional resrouces (preferably free) that I can look into?

Any help would be appreciated. Thanks.