Yi's math tutoring has been amazing, and she has been helping with my math class since she was still an undergrad student.
I was struggling with my Calculus 2 class last semester; I only got a D+ in my mid-term exam, that's when I first got Yi in my college as an active tutor. After several tutoring session, my homework and quizzes every week improved to at least a B. And at that time was when we only know each other for a week. I was delighted with the tutoring session with Yi; she has a smooth and easy-going personality. Moreover, then we decided to study together twice a week. She seems to know everything about my class Calculus, and it went well as my final grade was a B- close to a B, if it weren't because of her, I would drop the class after the D- mid-term.
Also, I appreciate Yi's math knowledge, for me, I am able to identify my weakness, but I could not find out what's leading to my problem. However, Yi's knowledge of the subject is so good, good enough that she sees math as a systematic subject. Yi can identify my problem, and she can tell me where to study and what I am missing, and what to do in the next classes such as get more notes and read the book before the class.
Last but not least, one thing I noticed is that since Yi had already taken the classes some years ago and she just graduated, she would forget something about the specific topic, but never the whole picture. A definition of math language or a particular sub-topic at most, not a big deal, she will remember it after reading it for 5 minutes. I trust if she became a full-time tutor, she would do the preview and review after each tutoring session.
In a nutshell, Yi has always been helpful to my classes; to me, she is a delightful person with a great understanding of college math and easy to work with. In my opinion, Yi has no problem tutoring college mathematics!