Hello Vidya,

The calculation of the marks would be difficult, you can calculate your approx marks with the JEE mains Answer Key given Below:

Https://engineering.careers360.com/articles/jee-main-paper-2-answer-key

There is a pedicted formula from our team to predict rank

 Total No of students = 145386

Formula

Probable Rank= ( 100 - your NTA percentile ) x 145386 / 100

So your predicted rank  =40000 approx

The calculation of the marks would be difficult, You can check JEE Main paper II answer key with the given below link to take an idea about the marks.

https://engineering.careers360.com/articles/jee-main-paper-2-answer-key

A total No. of 1,45,386 candidates had appeared for January Session, Using the Formula (100-your score)* 1,45,386 / 100-

Your Expected rank will be 39,341 as per your percentile.

Good Luck!