Good Grades- Smart or Just Lucky

Ok i am just randomly writing about this now because this annoys me when people judge me on how smart i am from my grades. First off i'll admit i don't get the best grades but really how much do grades really matter? To me the only thing grades mean is that you know how to work the system, thats a good skill but seriously i've seen some people who i swear have no idea what they're doing but they get As all the way through yet you couldn't get an educated conversation out of them if your life depended on it. When were taught in school thats all we're tested on. We're tested on what we remember from the pointless lectures and rants. Not on what we really know if you can hold onto a piece of information long enough to put it down on your test you get an A you dont need to understand what your doing in order to get that. And this is why i think our school systems are flawed severely. Also the teachers don't always have the right facts,now i give them credit they have to remember a lot of things so a few discrepancies are expected i suppose. I remember some years ago my 'schol' friend was talking about world war two and the atom bombs. She mistakenly said that the two bombs were fission and fusion which she was right in the fact that they were different but not fusion and fission different,but rather one was fueled by uranium 235 the other by plutonium, they were both fission devices. Fusion didn't come along until 1952, 7 years after the end of world war two, So essentially what i'm saying is that school or college grades don't test you on your knowledge; it tests you on what you can remember of the crap you've been fed. I don't get the best grade usually around 80s and low 90s but i know enough that not everything they teach us is the truth, i know enough to research something further whereas other people- the ones who get As blindly believe that what ever the teacher says is true 100%, and thats what i think is wrong with our society.