What is the best way to maintain concentration

I would suggest you try to study in a quiet place without any distractions. Try to focus on what you are doing and make a schedule of what to do. That way you have time for studying and time to do other stuffs. Also there's a limit of how much you can study in a short period of time so I suggest study early on to also lessen the load and to avoid cramming. Most importantly try to have fun and enjoy studying.

See your problem is quite common but completely curable. I was once a victim of this problem. First of all try to understand why you are lacking concentration. Human mind cannot be idle when someone is awake and completely in sense. So whenever you are studying something your mind is thinking of something else. That is why you are lacking concentration. It seems the thing that your mind is thinking is more interesting for you. Your study, whatever it may be is less interesting to you. So try to bring interest in your study materials. If you cannot do it yourself take help from someone else. Consult with your classmates who doesn't get suffered from the concentration problem. That is your first task. Suppose you are getting bored of the letters written side by side in your textbook. Human mind always gets attracted to visual things. You may have noticed that colorful and pictureful stories attract children rather than plain text. So try to think visually. Make graph and pictures of what you read. Do all this things. You can get rid of this problem. Meditation can help you a lot to concentrate.

What I do sometimes is put on a song that I like on repeat. As my mind hears the song over and over again eventually it zones out of it... and since I was listening only to the song and nothing else, it blocks me from hearing any other distractions. Of course that might not be an option if you have a roommate (as I do) but it's something to try if you can.

Although we don't like to study, we have to study for success in life. when you will go to study please close your eyes for a minute and pray to God to make concentrate on the study.I do it always too.at the beginning it doesn't work but after a while i found it working.Please try it.