Hello Vikas

It's not about how many hours you study. It's about the way you do it. You can make some strategies and follow them daily. You can make strategies like how many chapters you have to cover in how much time. Make targets daily. Make sure that you will get enough time for revision. Also you can cover the chapters first which are hard for you and thwn cober the easy one. I hope and I am sure this will help you.

Thank you and all the very best.