If you want to concentrate on your study as well as want to develop a habit of regular studying then very simple the first thing start studying with any of your subject of interest. No other thing can better help you than this.
The second thing is to increase the time limit slowly-slowly, develop a habit of studying.
and last very important thing keep continuity towards study.
Once make a daily study plan. Try your best to follow this. Apply this for at least one month and then see the results. If you can keep continuity for one month then
You will be able to develop a natural habit of studying.
You will develop interest towards study.
You will enjoy the study.
You will understand things better and fluently.
You will find study has become easy for you.
Your mind will be tuned towards study.
Your brain will start working.
Your thinking process will begin.
The flow of ideas will begin.
You will develop concentration towards study naturally.
Apply this and this will bring some natural changes within you.