I failed the very first math test in A school. I now hold a senior reactor operator license, on my way to my second.* YMMV
Point is, you must learn it their way like the above poster mentioned, and at that time, I refused.
As far as holding to rating stereotypes, they are born somewhere.
There I was in the lower level head of a 688 class submarine, just finished showering, brushing my teeth getting ready for watch. The boat is playing "pick up the seal team without broaching the surface." They pick up said seal team and whilst I was brushing my teeth, the seal time LT burst into the head with his gear still on, tosses all of his radio gear in the sink next to me, something about rinsing all the salt water off before the electrodes corrode. Little did he know, the little push button timed faucet didn't work and neither did I until what happened next.
He pushed the button on the faucet, nothing comes out. I think "oh, doesn't work, I will let him use mine." But then he gets a dumb founded look on his face and cocks his head sideways.
He pushes the button again. I think "oh, this is going to be good. I will wait a second before offering him my sink."
Less time elapses this time before he hits the button again. Now, his face starts to scowl.
He then starts beating on the button, still no water. Blood from a rock, if you will.
I say "SIR!!!!!!! IT DOESN'T WORK! USE MINE!"
He says "Oh, thanks!"
Sorry for the hijack, but I believe in stereotypes for a reason.
*
I never failed another test and passed every following test in the 3.9 range and was on vols throughout the pipeline.