Hello there

There is no any clear answer as it totally depends upon you that how is your mind, your intelligence level and most importantly how you are prepared from basics for this examination.

I would suggest you to follow these basic steps and you can definitely crack this examination by devoting truly some months.

• First of all analyse the syllabus carefully and the paper patterns of joint entrance examination just to give your weightage to those chapters which are really important into this examination.
• After analysing the syllabus try to make your own time table that which which chapters you have completed and which is leftover.
• And If You Haven not completed your NCERTs then I would suggest you to firstly complete those to make your basics stronger as it is very important in JEE advanced examination.
• Try to solve as much as mock papers you can.

For more information regarding this you can refer to this link:

https://engineering.careers360.com/articles/how-crack-jee-advanced

I hope it helps you!

Good luck!