Anyone participating in BLS Crew must pass a swim test prior to start water-based practice. Swim tests are provided for a nominal fee at YMCAs.
The Parkway YMCA confirmed that they'll be able to do swim tests for members for free and for $5 for non-members. This policy should be true for all Boston YMCAs.
BCYF pools are not able to do swim tests at this point. But you might check with them later as we get closer to the on-water date.