HOW TO INCREASE MY STUDY HOURS

ok so I'm 17 and have my bitsat in 20-25 days, almost. The thing is I haven't really studied a lot. I didn't score well in JEE. My BITSAT session 1 score was 100, so I'm not quite confident. I am thinking about taking a drop, but since bits is left, I really wanna give it my all for once. Kuch nhi hua to drop it is.

The thing is I genuinely don't know how to start studying. My study hours are less, and I really want some unhinged tips on how to increase my sitting capacity and how to stay focused for long hours. AND HOW TO ACTUALLY START SOMETHING BCZ WHENEVER I SIT FOR STUDYING THE ONLY THING I CAN THINK ABOUT IS KI KITNA ZYADA SYLLABUS BCHA HAI, HOW WILL I DO IT?

I reallyy wanna give my best in bits this time. Help me if u cann plsss