It’s to your advantage to complete either the 7 course pattern/IGETC/UC campus specific courses and all major prereqs so once you transfer, you can concentrate on taking your upper division classes. Also, you are competing with applicants who HAVE completed them.
Here’s the info:
http://admission.universityofcalifornia.edu/transfer/preparing-admission/minimum-requirements/index.html
If you’re going to TAG to UCI, you have additional requirements but you don’t need IGETC however again, you’re competing with applicants who will have completed it.
http://admission.universityofcalifornia.edu/counselors/files/tag-matrix.pdf