Go through your 11th and 12th syllabus thorughly.
It'll be more than enough to clear JEE and get a good college, trust me.
And do go through last 5 years' papers. Solve them and all will be well.
Good luck!!

Dear Aspirant ,

Here is solution to your question

If you are dedicated towards your aim then no one can stop you from achieving success

In remaining one month you have to firstly figure out that which subject is your comfort and you can solve as much numerical as you can .Your fundamental must be strong and you should only focus on imortant topics and only deal with them .I bet if you devote 7-8 hrs regularly one month then you can crack Jee with a good score and get admitted into a reputed nit.

Here I am also mentioning a link from which you can know about important details and updated regarding Jee main 2020

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main/amp

Thanks