It would be very difficult to switch from Humanities into one of the two since med rad and nursing have courses in first year that are exclusive to them and you can only take them if you're registered in the respective programs. If you don't end up getting accepted directly to either, then you would probably have to finish your first year in Humanities, and then upon review of your first year GPA they may possibly let you into med rad or nursing, but you'd start from level 1 again. So you might want to consider another school if you don't want to waste an entire year doing something you don't want to do.
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