How do you say this? "Some people has an excellent ability in some aspects but they are not good at other aspects"

How do you say the organization that mainly works on protecting the environment? the protection of environment organization?

Do you say "it is beneficial for our future development" This is a sentence in my spoken English practice book. "It is also a good idea to improve my communication skills. And in this way, I can make more friends, which is beneficial for my future development."

Do you say "I will do better in my academic performances."? I will do better in my academic performances.

Some questions about my English sentences.(2) This is a question of a spoken English test. Question:Do you prefer finishing your work once you got them as quickly as possible or to wait until the deadline, why? My answer: I like to do things earlier because I can have enough time for preparation, for example, it was last semester when we were asked to give a presentation in the class, it was important because it would be scored as a very important part of our final examination. But the professor assigned the instructions by emails, and I'm the president of our student union, so I receive hundreds of emails every day. So when I found out that I have to prepare a presentation, it was only less than two days before the deadline. Then I do nothing else but preparing my presentation all the day. It was a very challenging experience. After that, I do everything at the first time. Could you please help me to correct my sentences so it can looks more native?

Some questions about the setences. This is my answer to a toefl question. Question: Describe the problem your contry is facing now. My answer: Now the most severe problem in my country is the environmental problem. Although some of the environmental problem is a result of nature causes such as the volcano eruptions, but I believe that most is caused by human activities. The first kind of problem I would like to say is the air pollution. Now more and more people have their private cars, so the air pollution has become a major problem in China. And the second problem is the water pollution. This problem is caused by the industrialization of the city. If we don't take action now to prevent the contamination of water, the water would be too toxic for us to drink. Could you please help me to correct my sentences so it can looks more native?This is a question of spoken English