Do 5 races. Upgrade to cat 3 if you wish.
I'm going to have to rethink cat 4. I've never been in a race where things didn't space out after 1 lap or so. Today we rolled around in a procession until half a lap to go. Feel like I didn't race. interesting course but rather obsessed with hairpin bends - lots of them, with not enough space in between to get up to speed.