I can’t say specifics for studios (I’m sure some places have different systems for accepting applicants at least) but on the whole I’ve had directors and boarders and comics folks alike say that the skill, portfolio and personality of the artist outweighs things like grades and degrees- if what they see is what they need they’ll take you on. That said, it certainly helps to have some training! And in terms of getting your CV looked at then yeah having some fancy letters after your name does help a lot.