Hi Nibedita,

According to the details, furnished by you

1st sem SGPA = 6.00
2nd sem SGPA = 6.20
3rd sem SGPA = 5.90
4th sem SGPA =6.60
5th sem SGPA = 7.90
6th sem SGPA = 8.10

Now it depends on your university and college and their guidelines. however I think your CGPA will be calculated like:

(6.0+6.20+5.90+6.0+7.9+8.10)/6 = 40.1/6 = 6.86

This is your CGPA athough your DGPA will depend on the scores of the last two semesters.