Quitting even though I just started

Just started working at Walmart in Canada and it’s my second week. I’m still a student and the schedule I got has been brutal. It’s crunch time right now In school and there’s a lot of important evaluations upcoming and I don’t want this job affecting my academics, but unfortunately it already has. I’ve been given too many hours than expected and it doesn’t go well with my school. Do I have to hand in a two weeks notice? Or do I not because I’m too new?

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