It's not how good you are.

It's not how good you are. it's how good you want to be. People who goes through school without having to work for the good marks, usually doesn't get that far. People who learns at an early age that you have to work to get what you get, comes further, cause they know and are used to work.
Don't do things half. Don't sit round and think; next time I will do it really good, but this time I'm too lazy. There might not be a next time. Do the best you can every time. Nobody like people who do stuff half. Give 100%, and you'll get back what you worked for.