Info on admissions to UC colleges for homeschooled students:

http://admission.universityofcalifornia.edu/freshman/homeschool/index.html

Admission by examination (SATs, ACT) may be the simplest route:

http://admission.universityofcalifornia.edu/freshman/requirements/examination/index.html

But this only works if an applicant hasn't taken a college-level course in the examination subject.

...pronounced like the long vowel and first letter of the alphabet...