To improve one must always be on the edge of ones own potential. Don’t look at what your friends are doing. Think about what you are able to accomplish today and aim higher, always challenge yourself instead of just aiming for a good mark or a “job well done”.
Michael Jordan was once asked how much he bets on golf. To this he replied “whatever makes me nervous”. This is a very important thing to always do. Do only things that matter to you and if they don’t you’re probably looking on them the wrong way.