Hello Aspirant,

There's a single system for every college in Delhi University. The deduction in your marks depends on the subject you will choose and the subjects you have  studied in your +2. If you're taking up a course, you need to take the percentage of your top 4 scores . That particular course will have subject lists A and B , if all your subjects are from List A , no marks will be deducted . If there's a subject from list B, 1% will be deducted per subject. If the subject you chose is neither in List A or In List B, then 2.5 % will be deducted.

Check this link for eligiblity criterion for various courses:

https://university.careers360.com/articles/du-eligibility-criteria

You can use this college predictor:

You may also check this link for expected cut offs for various courses in Delhi University:

https://university.careers360.com/articles/du-cutoff/amp

Hope this helps you!

All the Best!