Thanks for posting 小二的歌! It's looks like advice given by a teacher to their students. They are saying that it's best for students to have a 100% average before taking their exam. Their logic is that even if the student only get's a 60% score on the exam, their overall average would still be 88%. I hope that helps! In addition that that, If you're ever looking for professional lessons I've been instructing international students for over 10 years and would be more than happy to help you on your journey! If you're interested in learning more you can find me over @ http://www.italki.com/teacher/1610322 . Thank you for your time! -Chris