If you can be coached to make the standard, then you were already capable of reaching the standard.
Also, the IQ test that the military gives, the ASVAB, is a very long test. The average time to complete it is 90 minutes. The maximum is 154 minutes.
If you can be coached through that, then you've earned your place. And the simple truth is, people can be coached on the test and do better. Which is okay.