I have not done well in 11th class how should I study in class 12th to crack JEE Mains. What should be my strategy?

We all go through this phase.

But trust me ,its not late yet.
You can still crack mains and get your favourite college.

These are the thing you have to do-

1. Make a routine as weekends and week days.
On week days study class 12th syllabus and on weekends go for 11th syllabus.

2.Solve loads of Jee Mains question paper and try to solve NEET paper (only physics and chemistry).

3.Focus on your class 12th studies too because to be honest percentage matters.

4.Made a to - do list daily and follow it religiously.

5.Nothing is as good as mock test so make a habit of solving mock papers.

Feel free to ask if you have any more queries.

All the best!