It first came to me when PiMA launched its annual camp in the summer of 2019. Nevertheless, with such high requirements, I basically had no chance of entering. However, after having learnt on Khan Academy, I managed to pass its entrance exam. I no longer view Math as a tedious subject with numbers and letters. Up to now not only was I able to have a clearer understanding of calculus but I have also been studying more challenging topics such as differential equations, and the experience has been very informative and valuable to me.