To score good marks in your boards and JEE and KCET it is very important that your basics are clear.
If your basic are clear you can easily handle any type of questions.

You can make your time table. Make a list of all the topics which you have to complete. Try to cover important topics first which carries more weightage in the exam. You can also prepare your important notes which will help you at the time of revision. Set your daily, weekly amd monthly target.

Practice is the key to sucess. Solve as much as MCQs for your practice. Refer previous year papers for your boards and MHT CET exam for your practice.

You should also solve complete mock test series to analyze your preparation level and to know your strength and weakness. So, that you can prepare accordingly. Work on your time management as well as it plays a important role.

Revision is very important to score good marks in your exam. You should revise daily.

All the best for your preparation and exam!!