I didn't even take the O-Week exam since I knew I'd fail. IIRC, it's not specified what stroke you have to use, you just need to complete a set number of laps.

I also want to state for the record that the fact that my swim teacher was so much more HAIRY and GORGEOUS than anyone who'd tried to teach me previously had nothing to do with me passing the course. But, dayumn, it didn't hurt!