Hello Aspirant,
I do not think you are supposed to do B. Sc. Hons. after completing B. Sc., as both of these degrees are almost similar. Both have the same course material, and carry almost the same weightage, except that B.Sc. Hons. is considered more respectable, however, is almost a matter of marks.
Hope you understand my point.
Feel free to ask more questions.
Have a good day!!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile