If you can do all the questions in Reeds Applied Mechanics, especially the ones marked with "f", you should be OK. I think 1st Class is actually easier than 2nd Class, maybe it's because you have some idea of what it's about.
I agree with the KISS principle, the other piece of advice I offer every candidate I examine is RTFQ, understand what is being asked, what needs to be solved, what information is important and what is just fluff. If you can do all the "f" questions and get them right, you'll be OK.
Discourage incest, ban country "music".