Can I work a few hours outside the school to earn some extra pocket money?

Indeed, yes, you can. In Canada, International Students are legally allowed to work only 40 hours a week. No work in Europe, Canada, and the US are considered small. You can choose to work in supermarkets, coffee shops, and restaurants for a few hours to get those extra dollars in your pocket. Please make sure you follow the guidelines set by your institute before accepting any part-time jobs.