Hey,

there is no particular number of hours that you must study to score 95 percent. You just need to focus completely when you study. You can study for just 5-6 hours a day and still score 95 percent if you study at that time with complete focus. Just set up daily targets and complete it, whatever time it takes. 

Hi Abhishek..

4-5 hours daily study will be sufficient for an average student to secure good marks in board Exams. The most important thing is consistency.

One should devote these 4-5 hours with full concentration, consistency and in a  proper manner, this will definitely fetch him a good result.

All the best.