1）Advantages: kind, helpful, energetic, imaginative ...
2）Disadvantages: impolite, careless ...
3）Your advice on being a good student.
As middle school students in the 21st century，we own lots of good qualities. We are usually kind and helpful. When people have difficulties and need help，we can give them a hand all the time. We are energetic as well. We like doing sports and travelling. Most of us can work hard in class and play happily after class. In addition，we are also good at imagining. We are always trying something new and doing everything differently.
However, we also have some disadvantages. Some of us are a little impolite. Sometimes some disagree on school rules with the teachers, some seldom talk with their parents and even quarrel with them. What's more，we are so careless that we often make some mistakes in our studies and lives.
In my opinion, we have grown up. It's our duty to be polite and helpful. We should get used to school life and work hard every day. We must take an active part in all kinds of activities to improve our abilities. It's very necessary to talk to our teachers and parents if we feel stressed. Boys and girls，try to make your future better.