1. My words are hard but take them into a positive manner.
2. The reason of non-concentration is fear of completing syllabus.
3. Make a Time-Table of your studies and follow it.
4. At the end of every week; you will find that it is not working !
5. Don't worry. You need not score 100 out of 100.
6. If your plan is successful to 70% of your target, it is good. Gradually you will get speed and would be able to complete your studies.
7. Focus more on daily revision. I have already given some tips how to revise the syllabus. I will send you the link.