Well it does sound a little bit arrogant but actually in this world full of selfish people you have to survive. You are hardworking and independent, you have sown seed and grew your own tree of knowledge so how can you let anyone else eat the fruits. It is your earnings and only you should be able to get the profit. But it really doesn’t mean that if anyone comes to for your help and ask you some doubts, you shouldn’t clear it. You must help that person and also give them some references from where they can get help. You only need not to do one thing and that is, share your own handwritten notes. Because it is something through which you are going to clear the exams and you need to make sure that your answer sheet should be different and unique so that, it can get you maximum marks.