I know for a fact that amphetamines are prescribed much less often in the U.K. than they are in the U.S.
I personally have never used the RC stimulants [I'm assuming you're talking about mephedrone, methedrone, MDPV, etc] for studying, but from some of the stories I've read, it may be difficult to moderate your intake, but it is certainly possible. That being said, its also hard to moderate intake of amphetamine/methylphenidate (for some people anyway).
Have you checked the
trip reports section of Bluelight? Also, use the
search function and search for MDPV, etc.
This Erowid Experience Report may be of interest to you as well.
I recommend searching through the
Erowid Experience Vaults for the chemicals in question. Good luck!