Hii!
The time table which needs to be followed depends on you and your convenience. In order to give equal importance to JEE mains and class 12th boards, you need to start with studying and clearing the basic concepts of physics, chemistry and mathematics of class 11th and 12th. First focus on class 12th and along side, keep solving previous year question papers. This will give you an idea of the way the questions are asked in the exam. So, whenever you come across those questions, it clicks in your mind that this is important and you should give focus on it.
Solve sample papers for class 12th board exams and dedication this time Fully on class 12th boards preparation.
The link given below will help you with more information -

https://engineering.careers360.com/articles/jee-main-preparation-tips/amp

Hope this helps.
Good luck!

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