Dear Pratham
I saw your comment. If you are already engaged in any coaching centre and taking some test series. That's fine. Please be engaged in that only.  If you want to do practice more than that it leads to forgot all. Please follow their methods. And remember your methods too.
All the best.

And my organic chemistry is also not that much good.
So what should I do to make it strong?

Hey pratham,it seems that you are preparing well for the IIT and the jee exam but you are unable to manage the 12th and 11th class studies along with boards.
In this situation I would suggest you some tips to follow
Now that time is not so much left for you because in the month of March you have to give your boards so I would suggest that along with the preparation of your IIT you should start preparing about your boards
You can do this by quickly doing all the previous year questions of the boards like doing the 10 previous year question papers
And also arrange the notes of each and every topics of the syllabus of boards so that you can quickly revise at the time of boards.