Starbucks Hazelnut hot chocolate topped up liberally with Frangelico is an excellent way to get through class.
It is tasty, and helps dull the pain of scholastic pursuits. Plus, it is odour-free, so no one can tell you are boozing it up. No one, that is, unless you start acting drunk. Like by adding your own "The way I see it" statements to your cup, in which you slag the stupider members of the class, show it to your friend and then the two of you giggle like idiots for five minutes straight. Over and over again.
(title credit to Stormy.)