By the way, don't they give you the moment of inertias that you need on the front page now?
haha! can't believe I hadn't noticed that, guess I can delete those from memory and make space for something else now.
As for stuff I would usually derive... I'm memorizing a few specific electric and magnetic fields. Rocket velocity too. Also, the special relativity "right triangles" - i.e., if v = 3/5 c, the 3-4-5 right triangle tells me immediately that gamma is 5/4. Saves 30 seconds or so. There's also just some answers I've accidentally memorized because they're on multiple practice tests - like the 5/27 ratio for hydrogen emission wavelength problem.
You mean the rocket velocity formula that reared its head back in Q61 on 8677?
I'm in the same situation really, I think I've more or less got the core stuff down, logic gates confuse the hell out me though, guess that will be a case of committing OR/AND and so on to memory.
I've also found it useful memorizing simple stuff like sqrt2, sqrt3, ln2, ln3 just saves time trying to deduce in the exam, as well as things like cos60=0.5 sin60=sqrt3/2, cos 30=sqrt3/2, sin30=0.5, cos45=sin45=1/sqrt2 etc, saves messing with triangles.