又是一道简单的英语题请教。

Sure,T agree that .
I should admit that good grades are not the most important thing in life ,but these are necessary for ourselves to get more chances to achieve our dreams.They means your teachers may pay more attention on you and your parents may be proud of you .And they are the effective evidence to prove your strength.Of course,if we want to success ,we not only need to rely on good grades, there are other things.

Yes,I think so.
Good grades bring the opportunity to you sometime when many peoples are waiting for,it states that you are a good one in study and your good character.

No,i don't think so.For example,I'm not good at English.But I am very popular in school.My classmates all like me,because of my honest.