You presently have optimal time for the preparation of JEE
As they have announced the mains exam to be on April I would recommend to be completely through with all 12 class chapters.
What ever class 11 topic you think you are good at prepare them to your maximum potential and the chapters you do not know just give it a reading from your NCERT.
We will be planned with a lots of revision exams from our school side from the month of December so we just left with one whole month of November.
Till the portions get over concentrate on them afterwards spend equal time in class 12 as well as class 11 concepts.
After the completion of Board exams we will have a gap of 1 week to 10 days in which we are suppose to revise,please do not take any risk of learning a new concept at that time.
Try to take as many sample tests as possible tests possible to reduce exam pressure,stress and tension.