1. no cheat sheet, don't even think about it. 2. wrist watches without calculation and memory are ok, no clock, no computer clock, total paper based 3. Some will, very instrutive 4. mostly, same item sets, different multiply choices sequence or even choices
U need do more research before you make up your mind for it. Now that the money is out of your pocket and you think it's sth you really wanna do, do more research and tackle it