This is a bad idea. Snorting (instead of swallowing) the pill won't change how it affects you half an hour out (or further). It will, however, get it into your bloodstream immediately, giving you a quick high, and by hyperbolic discounting, it will make the operant-conditioning association between the pill and the high much, much stronger.

Ritalin or amphetamines are much less addictive if you take them in a pill, especially a slow-release pill and/or with some food. And if your reason is to be awake for an all-nighter on a term paper, you don't get any benefit from snorting.