Not really. They're just stimulants. Anyway, I'm very skeptical of this use.

I'd guess uni students are buying methamphetamines them because they have gotten themselves into a situation that they cannot handle - too many non-academic scheduled activities, not enough time management skills, possibly a heavy courseload combined with several weeks of avoidance of things they found difficult, poor sleep habits, etc. They need to stay awake and work. I don't think that's all you're talking about, though.

I wouldn't discount the idea that some have an undiagnosed attention deficit problem.