cheat sheet dilemma

if you need one, you have to much stuff to write on it and you can only write down a few things that you think may be important. If you do not need one you are allowed to have one and have no idea what to add on the space you still have left. Linear algebra is horrific and i am worried i do not manage to get the needed 40%, however there is not much i can write on my legal cheat sheet, because mostly everything isn't too hard if you understood it, but the problem is to understand it and to know what rules to apply on what task. It will be quite tricky and i just hope that there are enough tasks with clear solutions and not tasks that confuse the hell out of me to begin with.