Here are some tips for those who chose AA10 just because it's an easy A:
1. The grades of the assignments are just RANDOM. According to the rubric, a B+ means that you didn't put much effort into the assignment, but I remember for one assignment, I just spent five minutes and got an A+, and for another one I spent almost the whole weekend and got a B+. Other students in my discussion had the same situations in other assignments, too.
2. For the comments, my TA actually counted the number of sentences we wrote. I remember for my comment for the 4th week, I wrote five very long sentences fulfilled with details and thoughtful remarks, but I got an A- because for an A, I had to write more than 5 sentences. Next week, I wrote six very simple sentences which only contained the gist of what I wanted to say, and I got an A+. Then I used the same technic and got four A+s in a row.
3. Participation in the discussion will NOT improve your grade. I almost never participated actively in the discussion, and by that I mean besides our required exercises, I almost never raised my hand and said anything in the "free speak" part, but I got an A for participation every week. I also had a friend in my discussion who raised his hand and spoke all the time, but he got the exact same grade.

Overall, it was a super chill and relatively easy class, but definitely not as easy as some may said; it's very time consuming and it does require you ability to think differently.