Considering a BSci in mathematics hinges on a genuine interest in the subject rather than past performance in high school. Success in university mathematics often diverges from high school experiences, as the skills and study habits required are significantly different. It's crucial to assess personal enjoyment of mathematics, as a strong passion can drive success over mere academic accolades. Students can change their major within the first couple of years without penalty, allowing flexibility if they find the subject isn't the right fit. Ultimately, a solid foundation in high school math is beneficial, but prior competition experience is not a prerequisite for success in university-level mathematics.