(US) can I take a bunch of prereqs in a 5th year?

[throwaway1337]

I'm a 4th year undegrad currently attending a Candian university and plan on applying to US and Canadian medical schools. I'll finish my degree in the summer.

I don't have a lot of the prereqs that US schools are looking for (physics, english, calculus, orgo 2, etc.,). Can I take all of them even if I've already sent out my app to US schools?

Not really familiar with US schools that much so I was looking for some guidance

[envisioning]

.