By the way, don't they give you the moment of inertias that you need on the front page 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.
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