The only way you will truly fail is if you give up on getting through it!
Have you tried the tutor route? I know it's not manly, but sometimes just going through the same material with a little different perspective makes all the difference.
I'd offer to help personally, but live near a different ocean than you. If something comes to mind, let me know!
ps. I remeber getting out of the military and starting college, I had to take no credit math for two semesters... Once I learned how to study, and really resolved that I was going to keep studying until I understood and remembered everything taught, It all worked out. Not easy (read not much time left for partying, riding cycles, or shooting....), but the grades were there.... And now I can play a bit more...
Good luck!