You have less time to prepare for your boards. You can make your time table so that you can complete your syllabus on time and you get proper time for revision. 

You should make your time table according to your strength and weakness. 

As there is less time you should focus on the topics which carries more weightage in the exam. You can take help of NCERT books. Exercises which are given at the end of each topics are very important. 

It is very important to refer previous year papers as well for your practice.

All the Best!!