Hi Stryker,

For the top 20 percentile eligibility criteria, your total marks obtained in class 12 or any equivalent course will be considered. The total marks will be the sum of your marks in subjects that will appear on your mark sheet of class 12 or equivalent course.

So if anyone of CS or EVS is present then their respective marks will be added.

If both appear then, both of there marks will be considered.

If your board has top 5 system then the subject in which you obtained the highest out of both, will be considered. 

Hope this information helped you. All the best.