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Back in the heyday of Eastern Block athletics their sports programs tested and pidgeon-holed children based on their performances on similar tests. We would not have seen many a great player if that screening system was an EXCLUSIVE gateway to the pros.
That being said the actual testing does provide information on the raw atheleticism of the subject.
And as Jon has pointed out to train only to improve in test results is not totally productive, however if the training for the test improves the real athletic ability of the subject then there would be some benefit.
One does not lift weights as a part of baseball trainning program only to measure how much you can lift. But measuring how much you can lift may feedback on the overall intent of a trainning program.i.e. Can I hit further? Throw harder,run faster?
Rollerman