Good luck! But I have a sneaking suspicion that you don't need it
I think I was out of school 14 years before I went to University. I was totally freaked by the thought of my first exam in Anatomy and Physiology! I was taking it during a spring intersession and it was a full course. So the whole course was crammed into 6 weeks (plus 6 weeks of lab time) instead of 3 semesters. Talk about intense. We were covering 3 months worth of material in a period of 2 weeks.
When the marks were posted I was amazed to see A+ next to my name! I was so excited that I ran across the campus to find a phone and call a friend of mine who was my support and who pushed me and pushed me and told me to not settle for anything less than an A+ and to strive for even better the next time! I finished that course with a 4.0. I'll never forget that.
I was especially proud because I had applied to nursing school and because my grades in high school weren't all that great (family problems and no time to study), they only accepted me conditionally that I get at least a C+ in A&P, and I ended up with much better than that. I almost wanted to rub the nursing school director's nose in it, LOL
Come back and post and tell us how you did! I think you will do just fine and once you get that A+ tack it up on your wall and use it for motivation for your next exam!