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i agree with you, i always think good mark is the most exact measure of studying. On the other hand, you have bad marks doesn't mean you are stupid student, it only means you don't study  on the right way. Nobody want fail, this is really conflict, I think fail is necessary to study more and more. You don't have to study yourself, you must study with everyone, knowledge is so great and we always exchange it, update it every day. I think your idea is good and I like : "don't get good marks by all means". That's all! 

Many people say to me that: "You should study for your knowledge without the marks". But i don't agree with that idea. If you are in primary school, i think it is very important  for(to) you. If you get the good marks, you will be praised by your parents, teacher and everyone. Children will feel(vo or adj) very happy that is a moral force to help them study better. Similarly, you are in elementary school or high school, the marks will show you to be a interlligent pupil. If you study well and get good marks, you will have many advantages in all fields than your friends. Especially, you are in the university, you will have many chances to find a good job in the future. Of course, you don't get good marks by all means. You have to study by yourself. That is my idea about study. And you

your essay is goob . However, that have some mistakes

Thanks a lot!