For me, my OCD is for pronounciation. I won't attempt a language if I'm not confident that I can get the pronounciation correctly. As in, not have an accent.
I don't care about anything else in a language. Sort of a curse, since it's hard to learn any language without an accent after you're 12, which I'm waaaaay past.
I gave a city's name, but you give half of China as a target, how fair

But yeah, I'm sure you could understand the tianjinese dialect, although there may be a few words you won't know. But I speak perfect putonghua, if I say so myself

Not to brag, but I could totally be a CCTV announcer... if I only learned how to read

Ma, my voice doesn't sound that nice though, so I guess not. But my chinese pronounciation is perfect. English... used to be, not so much anymore

Well, I was sort of forced to go to Chinese school too, until they realized I had no motivation whatsoever. My parents forced me to do fencing, piano, sketching, watercolor, skating, swimming, baseball, basketball, skiing, snowboarding, Wushu... but I quit them all since I just wasn't motivated. But now I'm picking up piano again.
Well, let me tell you this: the worst students in the worst schools in China come here and get straight As. I know more than a few examples.
Actually when I was young and not so critical of the world, and when intelligence played more part in school achievement than hard work, I did quite well, even in China. I wasn't the very top, but about 96% average. Pretty much everyone had 90%+ though... I remember this one English test where I got 96% because appearantly my stroke order for writing the letter "E" was wrong, and I didn't put a little tail on my t's. :@
And I remember my English teacher seriously tell everyone to pronounce English words like pinyin. I almost puked. She calls giraffes "Ji Da Fu"... and the whole class followed her... poor class. This is why I'm totally against my cousins learning English in China. It probably does more bad than good...
But yeah, back in the day, students weren't that competitive (moreso than here though, definitely). When my parents were in school, it was so chill... they got half day classes and barely any homework...
But now, my cousins in grade 7 has to stay up and do homework until 2am EVERYDAY, and wake up at 6am. And it's the norm, not an anomaly. Kids in China are crazy these days. Piano, art, sports, and a hell lot of homework. everyone's competeing, since there are so many people, and only so many spots in prestigious universities, and even less in jobs.
Getting into a "good" elementary school costs 120,000 RMB. Seriously. Not private schools, but a PUBLIC ELEMENTARY SCHOOL. You say "but schools in China are supposed to be free". Except that that's only on the surface, and without a "gift" or connections to the top, you won't get anywhere. My 6 year old cousin "only" paid 6k RMB to get into her elmentary because she's coming to Canada soon, and so they don't really care too much about which elementary she went to.
So yeah, Chinese people areabsolutely crazy about schooling, and I highly doubt you'd survive there either. (although I don't know you, and yo might be a uber genius).