This means that you will have come across new friends both in the classroom and outside the classroom, or may come from various activities in the school, such as singles tennis, or go out with friends.
That means that you can meet new friends, both in the classroom and outside the classroom or from activities such as the school tennis club. Or go out with friends
That means that you will meet new friends, both in the classroom and outside the classroom, or may come from doing activities in school, such as the tennis club. Or go out with friends.