For most unis outside North America, you apply in to a specific major/program, however. Though some like Natural Science at Durham or Art&Science at UCL are flexible.
Canadian unis tend to be more flexible than European ones, however, and the Arts&Science degree at McGill, the Harvard of Canada (OK, it’s more like the UMich of Quebec), isn’t terribly expensive even for internationals.
Roughly what goals do you have after college/uni?