However, in my opinion, the classmates should be regarded as the most important influence on individual achievements.
kindly looking back to your prompt
Do you agree or disagree
it is better to you to state about your position as you agree or disagree
. Adding this in introduction, actually, will be increased your mark in task responses.
Looking backward to the prompt in answer the bodies
Classmates are a more important influence than parents on a child's success in school
Probably, in the first paragraph you can make a comparison contrast
that classmate are more important
than parents in influencing student success in school and vice versa in the next paragraph.