David Allen's idea about having a "costume" for getting yourself into the mood to do things, like putting on your workout clothes to get ready to go to the gym, applies here. Is there a certain environment, like the library or student commons, that really reminds you of studying? Or is there certain equipment like notebooks, highlighers, etc that trigger it? Even certain smells or foods like coffee or tea can do it. When I was an undergrad, all it took for me to get ready to study was to go to the student commons and buy a cup of coffee.