yeah, if you suck at swimming the swim test can be challenging though. used to be that i could barely do 6 laps backstroke in 12 minutes (old fundies test). i'm naturally negative with short arms and legs and a larger cross section and i just naturally suck at swimming so i needed to do a little work. i had to learn how to swim freestyle and learn how to breathe correctly, had to learn how to not kick so hard (mostly i kick to try to keep my body horizontal rather than for propulsion). and i did 400 yards in 10:25 after not swimming for awhile and without any prep beforehand, but i'm better off building up my upper body strength with a little practice in order to do 500 yards...
if i can do it, anyone can, it just takes committing a few months of practice at the pool...
But without any sort of coaching you did it!