If you can get at least some of the equipment that you're tested on. Every event I've seen people practice for the event before they compete, think of this like a contest, what "events" do you have, how's the best way to train for them, what equipment do you you need (what do you suck at), give yourself some time to get used to the equipment & you'll kick arse at the tests. Think about what you need to do (& what your expected to wear to do it), train specifically for the program & in a few weeks you'll be up the level you need to get in.
Treat it like anyone treats any other sporting challenge, break down every big task into small bite-sized goals (like you took 8 minutes to do a 5 minute course, ok you want to get down 3 minutes, over 3 months that means 1 minute a month, over each week that 25 seconds improvement (if you can't make that, just aim at smaller increases, break it down until you can achieve your goals).
With the ladder, practice balancing a ladder on your shoulder, you could also practice controlling an off-centre ladder of similar weight/length, just incase nerves get to you & you make the same mistake again.
Thses are a few ideas, you really aren't that far away from your goals, I wouldn't give up. I'd just work out a rational program for achieving my goals & work from there.
Good luck with your goals & hopefully if I'm ever in need of rescue they'll be people like you out there willing to put their arse on the line to save me