See JEE MAINS is one of toughest examination in India. So with just a preparation of 1 month clearing it is quite hard but not impossible. The thing which you must be concern about is the knowledge you have. You have to judge that if you have zero knowledge or you have knowledge but you didn't used it yet to solve the JEE problems. If you have zero knowledge i.e., you are starting from the beginning then it can be harder for you. But if you have your basics clear, you have studied the subjects in some way or the other, then it would be less harder for you.

Now for 1 months strategy, I would say you should prepare the high scoring topics first. There are some topics which have a very high weightage from quite some years. So if you can prepare those topics, then the chance of getting 100-120 can be achieved.

For the JEE MAINS chapterwise weightage consider the link below:

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

I hope this helps. Wish you a great day!