Unless you graduate a semester early, or avoid graduating a semester late.
Of course, credit units may not be that valuable if the college does not give subject credit or advanced placement for the specific AP scores. For example, UCs give at most 8 quarter credits (5.3 semester credits) for physics AP scores, due to duplication. And UCB will probably give you no subject credit for physics 1, and one semester of physics at most (depending on major) for 5 scores on physics C.