Hello y'all, i was wondering if someone who's studying/studied sciences could give me some advice

I'm considering transferring from an Arts degree into Science. I've been away from Uni since last September as I was burnt out and didn't have any motivation to study what I was, and since then I've thought more about what I actually want to do, and I'd like to explore the possibility of working with animals (perhaps as a veterinarian) which would require me to undertake a science degree. The problem is I've never studied chemistry, and haven't done biology or physics since year 10.
I'm returning to Uni next semester and I'd like to take 'Biology of Cells and Organisms' as a breadth subject as part of the Arts degree, and if I can, 'chemistry 1' but from what I've read this subject require me to have done chemistry in year 12 - which I haven't

So basically, I just wanted to ask what any of you would recommend? Do you think if I decided to undertake these classes next semester (just as breadth for now) I'd be jumping in the deep end with little hope considering it's been five years since I've studied any of it? Do you think reading VCE 3/4 guides would be a good idea? Or would basics from VCE 3/4 be covered in the early part of the class, in other words, do you think it would be wise for me to show up with no preparation to week one?
Cheers
