Hello there,
Since you are studying in 9th standard, i would highly recommend you to keep your basics clear. A clear understanding of all the topics will help you to answer almost all the questions. Rather than learning the concepts, understand the concepts.
I would recommend you to start clearing your concepts from 9th itself as it will help you get more better understanding of the subjects in 10th.
Studying the whole day won't help, have the required breaks. One's mind need to rest to retain the knowledge. Studying for atleast 4 hours with full concentration would be expected by one.
Hope you have all the luck. And everything favours to you.