[_xhok]

The biggest assumption in this paste is that grades = ability. Getting good grades is a such a specific ability requiring so much dedication that getting bad grades may not necessarily reflect a lack of ability.

It may not be so wrong to think that others do better than you in school because you don't try, and that you are actually more able than them. The counterargument is, "Well, try for a bit. Show me what you can do if you just start trying." The problem with that is that your success at any moment isn't just your effort applied to the lever that is your ability. You have to build up to it. So even if you're smart, if you suddenly start trying to get good grades during high school you'll still be behind people who aren't as smart as you but tried the whole time you didn't. It's more accurate to say, you would be better than others if you had tried as hard and as long as they had.

A lot of smart people don't try at things that don't interest them but do an extremely good job at things that do. So, I agree with the spirit of your message that you should measure your abilities with your results rather than your own guesswork about your own abilities. But I disagree that school is necessarily the right metric to use.