I wonder why the present school system does not allow "outside" help during exams. Maybe it's not evolved enough.
Because its easiest to judge people on how much knowledge they retain. Not how they interact with groups or how inventive they are in solving a problem.
If Starfleet didn't want them interacting, they would've specified no talking for the duration of the test, which they obviously didn't do or else they would've held what happened against both Mordock and Crusher.