Failing Ap Calculus BC during senior year

[ucbalumnus]

http://admission.universityofcalifornia.edu/how-to-apply/after-you-apply/index.html says:

@University of California

If there are changes to your academic record…

Freshmen: If you change schools, add or drop a course, or fail to earn a C or better in a course after you submit your application, you must notify the UC Application Center by email or postal mail. Your correspondence must include your name, UC Application ID number and your signature (if you mail a letter), and will be available to all the campuses to which you applied.

If you receive an offer of admission, be sure to confirm with the campus admission office that they are aware of the deficient grade or schedule changes. Although you must notify the campus of these changes, we cannot guarantee that a campus can go back to review an application after correspondence has been received. Make sure to save a copy of your correspondence just in case.

Email: ucinfo@applyUCsupport.net

Postal mail:

UC Application Center
P.O. Box 1432
Bakersfield, CA 93302

Note that if you do not inform them of a D or F grade until they see it on your final high school transcript next summer, it is likely that your admission will be rescinded, since a typical UC admission offer is conditional on maintaining a high enough GPA in senior year courses that you have previously indicated that you are taking, with no D or F grades.