I want to use my collegeboard fee waivers and I know they only cover four fees. Do I have to send 4 fee waivers to cover the 4 or just 1 fee waiver to cover the 4?
You have to send one fee waiver for each UC campus.
This is from the UC admissions website on the testing requirements page:
And don’t worry - if you report your scores to one campus, they will be shared with every campus to which you’ve applied.