The way the question is stated, I'm really not sure exactly what
you are referring to. However, you can only receive the amount of
credits the course was assigned, no matter how many times you
repeat the course. For example, if a course is three credits and
you repeat that course three times, you only receive three credits.
The only thing that can change is your grade point average (GPA).
The highest grade is used in the calculation of the GPA.