Hello

Since you do not have much time left, my advice to you would be to start with th eprevious year question patterns.

It is not necessary to score full in JEE hence my advice would be to focus on the subject you are most confident in and start to solve previous year questions for that. This year there will be 90 questions out of which you have to answer 75, 25 from each subject.

You can go for any two subjects that you are most confident into score well (well enough to fetch you a seat through JEE Mains) if you do them properly in these 6 months. Besides solving previous year questions and reading NCERT atleast 4 times for each subject, you can watch videos from Vedantu (at a speed of 1.5 to complete the syllabus). They are pretty good and free of cost on youtube. You can also join the Crash Course of various  educational institutes like Vedantu, FIITJEE , Aakash etc.

All the best!