Hey,

This depend on the course you are applying to.

You need to include the marks of the subject you are applying for and along with that you need to include one language in your percentage calculation.

Therefore, for percentage calculation  you need to include the marks of subject you are applying, one language subject and rest subjecta you have scored good marks.

Different university have different criteria for percentage calculation. If you want to know about any specific university do let me know.

Although I have attached the link for percentage criteria for DU below.

https://www.google.com/amp/s/university.careers360.com/articles/du-admission/amp

Hope that helps.

Thank you.