Study permit for someone studying under British system

Hi, so I am currently taking A levels and want to apply to Canada for university. Issue is, we don’t get our actual grades until mid August so when I apply, I will be applying with predicted grades which in most cases will only get me a conditional offer. I need an actual letter of acceptance to get a study permit but for that I need my final grades and applying for a study permit in mid August when the first semester of university starts early September seems like too much of a gamble. Has anyone else dealt with a similar situation for A levels or IB? How do you get a study permit in time? Any advice would be greatly appreciated.