1.Model student
I think I'm a model student.Because I got good grades in the exams.
And when I'm take classes,my attitude is good.
So I think I can use word'model student'when describe me.
>>I think I'm a model student because I get good grades on my exams. I also have good attitde when I attend my classes. So I think I can use the phrase "model student" to describe myself.

2.Positive
I always take a positive view.
And when bad things happen,I don't give up easily.Because I trust everything will shape up well.
>> I always take a positive view. When bad things happen, I don't give up easily because I hope that things will get better.

3.Diligence
I'm very diligence.When exam weeks,I'm really studying hard.
And I never doze during school class.
>> I'm very diligent. During the exam week, I really study hard. I never doze during the classes at school.