帮我看看有没有语法问题！

语法错误倒是不多，但是这样说话完全是初学者的讲法，没有合理的连词和语序，都是“I am”开头，这样的句子听起来既枯燥又单调。另外，有几处表达有问题，看不懂，你应该是用中文的思维造的句子。

Hello ,everybody! My name is Diana，12 years old. I'm a humor girl. For working experience, I was a team leader before and now a joint Baker in studying. For other aspect, I am good at handwriting and I can dance well! By the way, I have lots of hobbies: good at drawing，dancing and many interest in reading

注：a joint Baker going to learn你是想说”正在学习中的...“吗，那就用in studying.
I have the experimental primary school, among the best results. 这句话我看不懂，你是想说你你以前上的实验第一中学吗？among the best results是指什么？如果是指学校，那就不该用”Result"。

供你参考：
I graduated from experimental primary school, which is the NO.1 in the city.

I am a humous girl .I am 12 years old. Who had been a squad leader and now a joint Baker going to learn.这么该会好一些
I am a humoros girl of 12 years old,who was a squad leader before .And I'm a joint baker now.
I am good at drawing，dancing ,and