Hi

As till now, students have been selected and qualified only if they clear the individual cutoff for each subject. I don't think you can clear Mathematics with only 2 marks. You have to score more than the individual cutoff in Mathematics. Also without clearing the same won't allow you to take admission in IITs. 

For further information check this link : https://engineering.careers360.com/articles/jee-advanced-cutoff

Best of Luck.

Hope this helps.

Cheers!