The following questions come from Cambridge IELTS 7. I've underlined some of the good words and phrases in my answers.
1. Why do you think some school teachers use competitions as class activities?
I think teachers use competitions to motivate the children in their classes. I'm sure that teachers try all kinds of activities to engage their pupils, and competitions might be one of the best ways to keep children interested or get them excited. Children love winning things.
2. Is it a good thing to give prizes to children who do well at school? Why?
It might be a good idea to encourage children to do well in games or sports, but I don't think we should give children prizes for their academic work. Children need to learn that the reason for studying is to learn useful things that will help them in their lives. I don't like the idea of children thinking that they will only work hard if there is a prize.
3. Would you say that schools for young children have become more or less competitive since you were that age? Why?
I'd say that they have become more competitive since I was young. Children now have to take exams from a much younger age, so I think there is more of a focus on doing well in tests. Parents also seem to be getting more competitive; I think that many parents push their children to do extra homework rather than letting them play with friends.