What is the chance that I can get job with a permanent work permit?

Hi, I'm actually a Chinese born in Malaysia and studying in Canada. I speak fluent English and mandarin Chinese. I'm currently pursuing Bachelor Degree of Actuarial Science.

Why is the Work Visa only valid for 30 days? And I heard that the renewal is like 12 months only. That means I should apply for the visa renewal every year?

Thank you.