In regards to abstinence:
It's easy to be celibate, all you have to do is take a vow of abstinence and remember to release your sexual/creative energy in other ways, so that it does not become a problem for you.
Physical activity will let you release a lot of energy, the more intense the activity, the better.
Doing something artistic, or creating something is very important, NOT just to keep you distracted but because sexual energy is creation energy. If you are not using up your sexual energy, you must learn to use it to create other things, like arts or crafts.
Also, find a faith to follow, a spirituality or religion that will let you concentrate on more meaningful ways to spend your energy. Abstinence may actually increase your psychic abilities because it increases your creation energy. Look up the law of attraction, you will be able to create your reality a lot better when you have more creation energy to use.
If it is too hard to go cold turkey, take baby steps to acheive your goals.
Sexual urge is normal for a normal and young person. You cannot suppress it after all it is energy. Howeer you can convert it to mental energy. Learn abdominal breathing/ practice it. and when you are excited sexually, just breath slow and deep abdominally. This will calm you and help you to concentrate on your study....... If you tired and bored or excited, so some P
T movent and abdomina breathing. this will help you in your study and make you free from clutches of masturbation.You may do once in a blue moon to give you a bonus by really ejoying masturbation. It will not be a mental torture but cathartic.Wish you best of luck in mainting serenity and succeed in you exam so that you get a cosy job in USA.MY blessigs.