It is a comprehensive grading patter where credits are awarded for the subjects you study . Core papers are giving greater value while management subjects or subjects from other disciplines are awarded leaser. Therefore, based on your grades in each paper . Your GPA is calculated by summing-up all the grades of the 8 subjects of that subjects and multiplying it with the credit associated with each. Then divide the product with the total no. Of credits allocated for the sem. You ll get your gpa.
A cgpa is a cumilative Gpa of all the semesters.
Hope my answer satisfys your question. If you feel any ambiguity refer the University website to get clarity .