Yes ofcourse.

You can definitely crack JEE mains by 1 month. But the thing is that you have to work a lot more harder.

If you are taru with your NCERT textbooks, and if you are good with the problems solving you can definitely crack the exam

A competitive exams totally dependent upon how competitive you are. You should be able to attend the question easily and should be able to solve it quickly. This is only possible if you are taro with all the chapters and maximum number of questions. Only practice can help you get the result good. You have to try solving many problems and try to attend as many as questions possible. If you try hard you will definitely get the result of that. It is never impossible, but you have to put a lot more extra effort for that.

Thank you