Sharing- thinking and doing

It's so common and easy when you share something with your family- Sharing without any regret, hesitant.  How about sharing with friends and other people who live around you. 
I remember when I read an interview or a normal post in a online magazine in which an excellent student said that she only shares her experience with her younger brother not even with her best friend because she is so worry that the experience she has to take lot of time to achieve can help other people reach a higher position than her. Although there are lot of comments after this posting, most of them blame her opinion and some even assume that she is too selfish and wish she cannot get any success. The  post was long-time ago but I still remember not because of interesting in her experience or the comments of readers. I just wonder how about me? If I am so excellent in English and have a high score in English test due to some tips, so at this time, do I share with other people like posting in the Internet, sharing in the Facebook or teaching some friends?? (Haiz, so luckily that this is "if sentence" because now I am still stupid in writing, stranger in Speaking, confused in reading, and inactive in listening haiz ).
Nowadays, the more and more story I heard about chances to cooperate among Vietnamese and the sharing among students. Not much good ones if they are compared in the total stories. But have you have access to Ulsan website in anytime? If you have, do you ever glimpse over English club?  In the case you did, do you notice a person who always upload lot of TOEIC information on every month? If you didn't like me before, let me explain to you her work to get fully file to you. She has to access to a Korea website, copy each sentence and answer for 100 questions in a test. This  job takes much of time and is so boring but she did for more than 3 years. Especially, not much people know about Korea language and even they know Korea language, they didn't do much of time to collect and share all the information. Thanks to her, lot of students learn and get the excellent results. 
Just small story but I believe that Vietnamese students are always cooperating and sharing together to get better result with each other ^^
Thanks for my friend, my sister :)