Contrary to their experience, caffeine has the same effects for me before and after Lexapro.

Still, you will perform better if you get full nights rests. The loss in your productivity and mental acuity from lack of sleep will far outweigh any extra hours spent awake.

The more successful thing you could do is schedule large and significant blocks of time to work -- with breaks -- sleep enough, make sure you're well fed and hydrated, and you need to prioritize what you're going to work on.

Sit down first and analyze how much work you have to do. If there's just not realistically enough hours in the day to do everything, spend your time on what will give you the most bang for your buck. It's better to pass 3 classes than try to pass all 5 and fail all 5.