The confined water swimming skills should be the least of your worries. They are very simple and should be easily accomplished by anyone considering the Divemaster course. Hope the following is what you were looking for.
Swimming Skills. (confined water) Using no equipment, demonstrate the ability to:
-Swim underwater 25 yards (23m) on one breath; no dive or push-off
-Swim 450 yards (411m) nonstop, any stroke, within 10 minutes and then swim an Additional 25 yards (23m) using any resting stroke(s)
-Transport another person of similar size 50 yards (46m)
-Demonstrate survival swimming for 20 minutes (treading water, floating, etc.)
Skin Diving Skills. (confined and open water) To be performed wearing at least a wet suit jacket, a weight belt adjusted for proper buoyancy, mask, fins, and snorkel as follows:
-Snorkel swim 900 yards (823m), nonstop, within 18 minutes
-Perform a Skin Ditch and Recovery