Hey! I graduated from undergrad in May 2020, then retook some first and second yr courses in the summer. In the fall, I took some additional courses at the 300/400 level. On uoft’s admissions site, it states that upgrade courses (to my memory, these are defined as courses taken outside of your degree) should be at the 300/400 level, with the exception of prereq courses.
although other schools in ontario didn’t mention anything about the level that upgrade courses are at (which leads me to believe they don't care) I laid out my prereqs in orpas by uoft’s guideline to avoid any headaches lo