The purpose of Cat5 races is to get comfortable racing in a large group in close proximity to one another. Results, other than staying with the group as long as possible, are immaterial. If you're doing A group rides you should be OK and you should be able to ask some of the racers in the group their opinion.

If you want to race in the fall, you should be riding as much as you can, ideally 6-7 days/wk.