Not an RVT but also applying fall 2024! I think for BC the lowest I've heard get called for interview (and based on previous forums) is a 79-80% overall not including best year, however, I know sometimes even if you get an interview they will say you sill need to get your grades up so not entirely sure on the accepted average. My advice is only to take the pre reqs you need and then take courses you enjoy/interesting arts electives maybe because those will be instantly grade boosting. I wish I did this rather than working towards a chem degree and taking courses that were impossible to do well in because I wasn't interested, in my 4th year I started taking upper level bios and psychs and did super well, so its all about what you enjoy
As for experience you already have clinical experience under your belt so maybe work on some community involvement, hobbies, and other species? For example if you worked as a small animal tech maybe find some large animal volunteering? This is what I have heard from some technician friends who have applied!