帮我看看这段话有没有语法错误

题目

帮我看看这段话有没有语法错误
I might not be the best applicant among all the international applicants,but I am and will always be the most diligent and the most special one.I plan to double or even triple major in the college and I want to pursue further graduate degree.I am not the typical bookish student,I know how to make Chinese knot,I learn violin by myself and now I can play several songs,I love singing and once was the member in the school choir,I love doing volunteer work:I have tutored a lot of kids with autism.Compared with those who have high SAT scores but have spent a lot of money and almost all their time on preparing for the SATs.I think I am better than them even though I may not have that high scores.

答案

learn the violin.once I was