Obviously not BBB but I have used Noops for around 2 years consistently,
Pira would probably work, though it doesn't have the reputation for having the anxiolytic effects that Ani does (I don't notice it to a large degree, but I've never been a nervous test-taker).
Pira and ani are both the kind of drugs you take everyday anyway, so just like other things you take everyday you want to take it on test days (keeping things routine for tests is a good idea, too).
My pretest attack pack: Caffeine (dose varies but upwards of 250mg some days, I have a very, very high tolerance at the moment)
Nicotine (patch or dip, patch if I'm really dragging ass, dip on the way to the test if I only need a small pick-me-up).
Ani 600-700mg (1/4 tsp).
DMAE 1/4 tsp.
Occasionally aspirin (aching/sore muscles/joints doesn't help anything).
Usually all on an empty stomach ideally 30-60 mins before I sit down to take it.