No, multiply each grade on the subject's units. Then, you must have a sum of the products. After that, divide it to the total credit units of all the subjects you've taken. That's all
@Abja please be guided here Academic grading in Nepal - Wikipedia, the free encyclopedia, and here WES Grade Conversion Guide first before this one: I think your grade is somewhat bet. Div. I Distinct. and Div. II Merit. Great job! n_n NOTE: Disregard the percentage since the passing grade in Nepal is 32%