Does anyone have any tips or guidance for studying and training for the EIB tests?

Approach each station like you've never performed that task before. Listen carefully to how the graders want it done then do it that way and that way ONLY. Forget how it may have been done at your last unit, how you were taught to do it by Sgt So and so, etc. Do it how they want it done

SMCT

Ft Benning publishes, updates, and revises EIB criteria. Local testers are given SOME latitude with specific tasks, but there is pretty clear guidance on how to do such EIB. I believe it is open to public (or at least open to CAC holders).

Things that will DEFINITELY be on EIB: Weapon qual, PT test, day and night land nav, 9-line MEDEVAC, evaluate a casualty, 12 mile ruck.
It has been FOREVER since I gor my EIB (or even since I was an 11B) so these things SHOULD be there, but I cannot guarantee: Call for fire, operate a radio, treat a casualty (user's choice of injury), camouflage self and equipment, ID and employ grenades.

There will probably be more. Prior to testing, they should have trainingwhere they ID each task and thoroughly familiarize with TCS, including go/no-go criteria. (For us it was 1 week of "practice", 1 week of testing.)

It’s muscle memory. Go through the tasks at a comfortable pace over and over. If you’re trying to beat the clock and overthinking it you will probably choke( like I did).
Try trial runs without pressure.