Yes. Then you will be sent back to 6th grade. Hope this helped. :)
It means you didn't prevail in what you were doing, you were unsuccessful, you made a blunder, and basically, it's an insult.
Fail 5 means mean that the radio is not detecting the COMCSEC CCA. This is usually due to the radio's COMSEC knob being in the PT position.
Even if you don't get the desired result, having tried your best will at least yield a sense of accomplishment and some sort of experience or learning.
Means you dont succeed.