Schoolmate, classmate, and fellow student are more or less identical, meaning "someone who was in the same school/class/college as me at the same time".
How would you define your classmate?
Your classmate is someone who goes to school with you. ... Your school friends are your classmates, and so are the fellow students you barely know at all.
How can I be a good classmate?
- Be nice to others. Give compliments. ...
- Be pleasant. ...
- Let go of little irritations. ...
- Don't hold grudges. ...
- Concentrate on what is going right, instead of what is going wrong. ...
- Learn to be less critical. ...
- Be a good listener.