If you have adequate points, why would your PR be rejected? And even if it does, worst case scenario, your WP won't be hampered at all. With 1 year student visa you are entitled to get a one year work permit and for 2 years student visa you are entitled for 3 years WP. Having said that, WP rejections and approvals depend upon the course(s) as well. I am not a lawyer though. Just speaking based on the cases I have seen around me.
All the best