You may consider Allen's Online Coaching Program as they have a very Comprehensive Preparation Curriculum with an excellent Test Series. As far as Chemistry is concerned, you must also take help of Good Books, Materials like Rank Booster and DPP for JEE Main & Advanced by Resonance and make notes while you study. Remember, its always the Chemistry Section which is highly scoring and moderately less difficult than Physics or Maths.

For more information about JEE Advanced preparation tips do follow the link below

https://engineering.careers360.com/articles/jee-advanced-2021/amp

Hey,

These days all coaching classes are going online because of the pandemic so you can take the advantage of that and join any coaching centre which you like.

You can join CAREER 360, AAKASH, ALLEN. You can even go for unacademy subscription if you want to study a single subject.

Hope that helps.

Thank you.