For really good merit aid, you need to bump up that ACT score to above 33.
I’m a speech pathologist so I have some good knowledge about your field of interest. As you know, audiology requires advanced degree after your bachelors. You are looking at an AuD program…doctorate of audiology…and that takes at least several years. I would urge you to go to the American Speech Language Hearing Association website to get more information about this course of study. You absolutely want your advanced degree to be at an ASHA accredited university.
Audiology advances degrees are seldom fully funded. So you want to keep your undergrad debt to a bare minimum.
UTenn would be a fine undergrad school. Nothing wrong with that…at all.
Re: your IB courses and your GPA…you need to ask your HS counselor how IB courses are weighted in terms of GPA calculations at your HS. This varies by school. Regardless, you want to get the highest grades possible. Your GPA will affect your eligibility for undergrad merit awards.