I don't think it does. In school, grades only reflect how much information you can absorb. Because of my depression I did awful in high school, mostly low D's, and had to take an extra semester to get all my credits to graduate (and never did anyway). And that was after taking accelerated classes in elementary school and getting high A's and B's in middle school. So I know I'm not dumb as ****, even if that's what the grades reflect.

And even if a lot of people see success as having more money than you know what to do with and fancy cars and houses, I don't. To me, success is having good friends, and a family you love (related by blood or not), making enough money to pay all the bills comfortably and still have a little left over. A cat or two (or seven) on my lap. That's all I need.

Better grades make it easier to get more money, certainly, but grades don't define a person. They don't even define intelligence accurately. And what success means varies depending on the person.

Do as well in school as you can, it makes things easier in the long run, but don't stress yourself out over-much about them. Trust me, my boss doesn't care what my gpa was in school. What matters to him is that I have the skills I need to do my job.