Why the credit weighting matters more than people expect
A grade point average is the sum of (grade point × credits) divided by the total credits — not the average of the grade points. The distinction is invisible when every subject carries the same credits and significant the moment they do not.
Take four subjects: three two-credit ones at 9 and one six-credit project at 6. The unweighted average is 8.25. The correct weighted average is 7.5. That is most of a grade band, and it is the sort of gap that changes which classification a transcript falls into.