I afraid that if I use examples, it will take too much word.
Yeah, I know what you mean. You have to stay within their word limit. Well, what I had in mind was for you to cut some of the sentences that repeat the same idea, like this:
First of all, I have a bright personality and unlimited enthusiasm. I have been an outstanding student since childhood, which means I have a solid foundation of knowledge. This must have positive impact on my studies.
Questioning mind play an essential role in studying science, it is general accepted that science is a process of finding the essence of insubstantial semblance, so persist in exploring is the key of scientific research. I have a positive upward and strong self-confidence; I never afraid of difficulties and problems. My passion is the
momentum great potential of
scientific research in the fields of _______ and ______. (be specific). (Right here, add a thesis statement and then end the first paragraph.
My out-of-class activities in high school also contribute to my personal development. no need for this sentence.
I participate in student council and the ...
You don't even need to talk about student council or soccer unless you can use them as examples to support your main idea.
The essay should have one main idea, one big idea.
Sorry, but I disagree with Kevin. Your essay needs a lot of work.
Mike made great suggestions here. Do you understand all of them? It's true that you need a lot of work, but honestly your English is very, very clear and effective. You just have a few bad grammar habits, but almost all people have at least a few bad grammar habits.
:-)