Re: #5
http://admission.universityofcalifornia.edu/counselors/exam-credit/ap-credits/index.html indicates that you could get about 32 semester units for your AP scores. But note that if you take a college course duplicating the AP credit, you will not get credit for both.
See http://talk.collegeconfidential.com/university-california-berkeley/2081956-uc-berkeley-letters-and-sciences-ap-credit-policy.html for subject credit.