Hi Aakash,
As per the information given in CAP Brochure, "In case the candidates are awarded grades/CGPA instead of marks, the conversion of Grade/CGPA to percentage of marks would be based on the formula/procedure certified by the Board/University/Institution who has awarded the same. It is obligatory on the part of the candidate to bring the conversion certificate from the Board/ University/ Institution. Some universities award degree/class/grade on the basis of all three years’ marks, some universities award degree on the basis of two year’s marks and while some universities award degree and class on sum and total of all semesters. Candidates should take care to upload the correct marks/grades/conversion. If admission is denied to the candidate due to wrong filling of the marks, the candidate will be responsible for the same."

It means you are supposed to provide % of marks obtained. I hope it helps!