Brief Answer:
This is very simple- just change yourself a bit

Detailed Answer:
Hi young man.
I can understand the plight you may be going through.

Masturbation 3 to 4 times in a week is absolutely a physiological and normal in any normal young adult of your age if you are not married.

Can you please elaborate how the masturbation was started ? On its own ?
Since when the frequency inceased ?
Was there any reason like a personal / family or friends? Do you remember why was the frequency increased t this alarming level of 4 to 5 times in a day ?
Do you watch pornography ?
Are you single ? What are the times you get so much time ?
Are you a student or in a job?

I am sorry that I have to ask you a few questions out of the many I still may need to ask you to go to the root-cause that you got altered habit of frequent masturbation. Once the cause is found by you and / or us, it may be very very easy to modulate the lifestyle and have such changes that you start doing masturbation few times a week as a pleasurable thing to relax you mind and body- not as a source to drain your mental and physical energy.

You can certainly recover from it. It can take hardly a few days. As I do not know your detailed history I can chart you a few common things.

First of all you have to become very social, mix up with people, friends and family, get involved into a constructive activity, hobby or so in such a way that you are busy all the time. This will not give you time to get engaged into masturbation. GO for outings / vacation / tours. Try not to be alone at all. This will automatically suppress your feelings and alter them to more positive approach and help concentration.

Reading inspirational books of biography, religion, success stories of great people and to learn how they mend their ways and life. No one would ever imagine what can change your life to the one where you are full of enthusiasm. Even the smallest of the incidence can change life drastically into a very positive one.

Have you visited the religious laces of your belief? If not plan one.
Try to involve into exercises, games, social events to build up the positive approach. You do not have to force yourself into a particular thing, try the things you liked once.

All these things can help you recover from your present problems , help you concentrate and get back the strength of your mind. You are just 22 and the real life is yet to get started. Nothing is impossible in life, this is a very small problem compared to the ones you are going to face of day-to-day problems in the future. Thy name is life. Get up, get ready to change fast and swift.

I am sure you can do it.
Once you are successful, you are going to be the happiest person , as I too am will be most happy to see your change.

---

Brief Answer:
Believe me, you do not need any medicine

Detailed Answer:
Hi.
Sincere thanks for your feedback and determination.
Clean off your computer, throw away all the material you have, keep not a single thing which can distract you.

Yes, I never mentioned about a single medicine as I do not want you to take any to avoid dependence which can develop. So please do not try any medicines to increase your memory or concentration. You will not need any, believe me please. If such medicines do exist, I would have taken myself or given to my family or patients. There are no such medicines which really work. It is all heard and followed by generations.

Once your mind is well trained, your memory, concentration and brain function will automatically improves 1000 times. Actually the part of the brain which a normal human uses is only 10 to 20 % of the potential. Once you are determined you will use the resting brain to the optimum and everything will be fine in a very short time. You have one more month and you can cover the syllabus of the whole term / year within this period and still have time for all the activities I mentioned and will suit you.

Please fell free to clarify anything you have in your mind.
You may please rate this answer 5 stars if you liked.
Thanks you and all the best for your exams to.

---