Obviously you should first focus on your Stronger zone. But Don't take your strong zone for Granted. If time permits then go for the Weaker zone and with Weak zone i mean to say that you must have read something or you must be having some idea about. Just going from the scratch will not help now. If it is Inorganic then i would suggest you to focus on NCERT only.

Dear Aspirant,

Exactly this is the approach you must follow. Concrete your concepts in the topics you are comfortable with and after you are done with those topics, see important questions from the remaining part. That will be enough, but make sure that you have completed the other subjects and topics to complete accuracy.

Hope this helps. Thank you.

For more details on preparaion, refer to this article: https://engineering.careers360.com/articles/how-prepare-for-jee-main