Good grades? smart or just lucky?

Ok im just randomly blogging about this now because this annoys me when people judge me on how smart i am from my grades. First off ill admit i dont 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 ive seen some people who i swear have no idea what theyre doing but they get As all the way through yet you couldnt get an educated conversation out of them if your life depended on it. When were taught in school thats all were tested on. Were tested on what we remember from the pointless lectures and rants. Not on what we really know if you can hold onto a peice 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 severly. Also the teachers also dont always have the right facts,now i give them credit they have to remember alot of things so a few descrepencies are expected i suppose. I remember last year my history teacher was talking about world war two and the atom bombs. Our teacher mistakenly said that the two bombs were fission and fusion which he 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 didnt come along until 1952, 7 years after the end of world war two, So essentially what im saying is that school doesnt test you on your knowledge it tests you on what you can remember of the crap youve been fed. I dont get the best grade usually around 70s and low 80s 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.