Anecdata here, but I met a person in university in the 90s who claimed: 1) they had access to really, really pure cocaine, and 2) they used it to study for te

Anecdata here, but I met a person in university in the 90s who claimed: 1) they had access to really, really pure cocaine, and 2) they used it to study for tests. If I recall correctly, they were only using cocaine for the studying, not the test taking, and that they had good recall on tests.