1. Study WHEREVER YOU FEEL WORKS BEST FOR YOU! If that is your desk, amazing, want to study in bed? Do it. Everyone is different, and it is whatever works best. Personally, I like studying in the kitchen- it is a brighter space and it stops me from becoming cooped up in my bedroom.
2. Work until your laptop dies- this is something that has worked for me as a means of managing my time, and making sure I don't overdo it. Charge your laptop, work until it dies, and then take a well earned break.
3. Stay hydrated and well fed.