an indica strain would be best for general pain, and nerve pain/spasms ... but, it also makes you sleepy, and studying will likely be difficult ... Northern Lights, Master Kush, etc., may be good choices ... potent, but not devastating ... for long-term dosing, using cannabis in a brownie, cookie, etc., takes about 2 hours to kick in good, but usually lasts 4-5 hours, with most people, it seems ... I have had excellent results from smoking pot, with nerve pain/spasms, and depression :thumbsup:, but, I'm not involved with 'intense studying' ... posting this reply, is about as difficult as it gets