How to get rid of horny thoughts and concentrate on my studies?

Sexual behavior: If you find that you're easily distracted, increasingly seeking sexual gratification, and excessively involved in sexual behavior, such that you are neglecting the priorities in your life, you may have a mental disorder. While it's desirable to have a healthy libido (sex drive), it becomes unhealthy if it leads to painful consequences. Discuss this with your doctor.

To Study: Practice: With time and practice. If you are going to grow and be educated you will have to learn what the rest of us have learned and that is to train your brain to focus on the tasks at hand. There is a time and place for life's activities. And, there is a time to work. Practice will help as you mature into an adult.

Keep perspective: You're at your peak for for learning and for sexuality. The former will prepare you to be a fulfilled and productive member of society and, perhaps, the head of a family. Sexual pressure can be overwhelming for any guy. Almost all men your age masturbate both for enjoyment and to be able to stay focused on other things. This might be a great time to talk with dad about your changing mind and body.