When I was in College, I would always make sure to pray in the morning, night, and in between. Especially before classes start. For worshiping or singing, I'd go to school about an hour early or even 2 hrs early, find an empty classroom or the library and listen to worship music through my earphones whilst singing along. On the bus/car ride home, I'd pray and listen to Christian music. Before taking a test/exam, I pray for God to help me focus, to understand the questions being asked, to help me to recall in perfect clarity all that I've studied, and to help calm any anxieties I may be feeling before a test/exam/presentation. If there's people in the classroom, I just pray quietly under my breath.