Due to the pandemic, complications have arose in my household and I cannot prepare effectively for the AP Exams. Will my offer be rescinded from UCR if I cancel my exams?
No. There’s also no way they knew you were taking them in the first place.
probably not - but its a good idea to contact UCR and explain your situation - if only to ease your mind.
The only thing at stake would be credit for any GEs the tests would have afforded you. Not your admission.