The 30-minute exercise you can do every morning is a great way to ensure you're able to stay focus throughout the day. Additionally, it helps to keep your mind sharp.
Ideally, you shouldn't be a student all day. It is important to be able to enjoy your time without your books, having a chat with friends, or doing something similar.
Talk to your teachers and any other members of your academic team. Chat with your friends and other acquaintances when you feel that you're focusing too hard on your studies.