Hello Shubham Mishra,

Here is a link to the pdf shared by NTA regarding JEE Mains guidelines:

https://jeemain.nic.in/WebInfo/Handler/FileHandler.ashx?i=File&ii=4&iii=Y

You can visit the following link for further details about the normalization preocess:

https://engineering.careers360.com/articles/jee-main-normalisation-process-how-scores-are-calculated

Hope it helps.

Best Wishes!