To calculate your GPD, you first need to find your cumulative GPA. This is done by adding up all of your grade points and dividing by the number of credits you have attempted. Once you have your CGPA, you can subtract it from the GPA you need to graduate to find your GPD.
A GPD can be a serious problem, especially if you are close to graduation. If you have a GPD, it is important to take steps to improve your GPA as soon as possible. This may involve taking on extra classes, getting tutoring, or withdrawing from classes that you are not doing well in.