Hello Sumit.

Firstly congrats that you got qualified. Please go through the cutoff criteria to go for JEE Advance from various sites. the cutoffs keep changing.

Please go through the criteria and compare your rank for qualification:

https://engineering.careers360.com/articles/jee-advanced-cutoff

https://collegedunia.com/exams/jee-advanced/cutoff

If you are qualified for JEE Advanced, you can start your preparations for it. Firstly, it completely doesn't depend on the time of how much you study but it depends ow much is your concentration and efforts for the subjects. Go through the syllabus carefully. Please don't try to mug up. learn as many tricks as you can to solve the questions and try to understand those clearly so that you remember it for a long time. JEE mains might have given you tough time memorizing the formulae but as the name itself advanced you can know how the questions would. Once again try to find your majors as time limit is important too so you can answer maximum questions in that way since you are strong on those parts and then work hard on the remaining part. Lastly don't stress yourself. Study as much time you want just put your concentration and mere efforts. You will definitely qualify jee advanced with a good rank.

All the very best!

Thank you.