Only 40 days are left before you face the April attempt of JEE Main. Just three pieces of advice.
First, don’t think this is “too little” time. Its not, because you have all the day to yourself now (boards are also related to JEE subjects, don’t make that excuse). Plus, you are yourself more serious now so a lot can still be covered in these 40 days.
The first 15-20 days can be dedicated to covering backlogs & relearning topics you are not good at. It will be impossible to do this later, and I hope you did this partly in April.
The next 10 to 15 days can be dedicated to revision. You will use this time to go back through your notes short notes and lectures. Make sure you go through every topic so that you don't miss out on anything that you didn't revise.
The last 10 days would be dedicated purely to mock test because mock are how you get a good score. Now this is not a concrete division, you can always do a mock test in the first few days as well - it's more about what to prioritise.
There is still a lot of ground to be covered. Many students will still see and increase of 50, 60 or 100 mark starting now so please work hard. Don't let these last few days pass without effort because you will regret it. This is the time when ranks are made or destroyed.
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