Need help finding tutor or course in Shenzhen, China

Dear yoniiix,

I'm sorry to hear about your low score the first time. It does sound like re-taking the GMAT is a good idea. I am glad to hear you have the MGMAT, which are arguably the best resources in print.

I would like to recommend Magoosh. It actually would be considerably cheaper than private tutoring, and it would provide you with the support you need. We have 200+ video lessons, providing all the content and strategy you need on the GMAT. We provide 24-hr online support for all our questions and all the questions in the official material, so if you don't understand something, we will give you an exhaustive answer to your particular question: in this sense, it's like online private tutoring. I don't know when you plan to retake the exam, but we have a variety of study plans you will find helpful:
https://magoosh.com/gmat/gmat-study-schedule/
Here's a blog that summarizes the math equations you need for the GMAT:
https://magoosh.com/gmat/2013/gmat-math-equations/
Each one of our questions has it's own video explanation, for accelerated learning --- if you get the question incorrect, then right away you can watch a video and learn about what you did. Here's a sentence correction question:
https://gmat.magoosh.com/questions/3219
Here's a DS question:
https://gmat.magoosh.com/questions/878.
Here's a PS question:
https://gmat.magoosh.com/questions/81
You can see testimonials here:
https://gmat.magoosh.com/testimonials
Finally, because you have already taken a GMAT, you would qualify for our score guarantee.
https://gmat.magoosh.com/score-guarantee

Even if you decide not to pursue Magoosh, please use our free blog --- there's a ton there that could help you. Also, if you have any questions you post here on GC, feel free to solicit my help.

Let me know if you have any questions.

Mike