I'm just wondering if I could msaf French 1z06 in class test? It's 20% and it's tomorrow!! If someone can reply to this i would appreciate it!

I'm very sure you can
Just google MSAF mcmaster and fill in the appropriate blanks

Yes, you can. Don't just MSAF it though because you don't feel ready. Makes sure you have a legitimate reason such as illness or a family issue. The grade value (i.e. 20% of your final grade) will be transferred to your final exam, so be aware that by doing this, you will write a final worth at least 50% most likely.