a pupil in the same school class.
It is important that all students learn to get along with other classmates, even if they are not particularly fond of them.

an organization for people interested in a particular activity or subject, or the place where such an activity is held
It is fun and exciting to belong to a science club.

to talk in a friendly and informal way with someone
Even though they were far apart, the couple chatted every day.

to be friendly to someone
You don't seem to get along with the new students.

to (cause to) become better, of higher quality?etc
If you study hard, you can improve your math scores.