I’m currently taking classes at a CC. I have 23 transferable semester units completed. By the time I transfer in 2017, I will have approx. 102 transferable units since I’m setting myself up to qualify for econ and science majors at USC, Berkeley, UCLA, and so on. I plan to take a few lib arts and social science courses such as English, History, Humanities, Art History, etc. in summer/winter or online. Will this impact my acceptance to these three schools? And when it comes time to transfer, since I will be over the transferable credit limit, who will decide what classes I will get credit for? Thanks in advance everyone for answering… 
I don’t think taking the classes online via your CC or an approved source for transfer, no. But the excess units can’t be to your favor, have you visited a transfer advisor yet?
Nope, but it sounds like I may have to re-organize things. I took these 23 units of classes before I knew what my goals would be. Now I’m confident I want to do pre-med and transfer into Psychobiology at UCLA, Nutrition at Berkeley, or Econ at USC as a “fallback.” Together with the GEs and lower division requirements, I don’t see myself getting below 85 units. UCLA and Berkeley want me to take 4 semesters of Chemistry, 2 semesters of Biology, 2 semesters of Physics, and 2 semesters of math (50 units total). Tack that on to the 23 I’ve already completed and that makes 73. After that I still have to take a few other classes to fulfill the GE curriculum.
I’m not staying for that long (2 1/2 full-time years) and I only have to take one more (3-unit) class in order to fulfill the USC Econ transfer requirements; that’s why I’m doing it. This semester I’m taking GEs and introductory courses (pre-calculus, prep for general chem); in the Fall I can begin taking the lower-division science courses.