Grace Harlowe's Plebe Year at High School by Jessie Graham Flower

This delightful book tells about a group of smart youths who get up to some wonderful adventures together – and save one another from troubles. The unofficial leader of the group is Grace Harlowe, the title character. When Anne Pierson comes to the class at the beginning of the year, they decide to take her under their wing. Anne has a lot of troubles at home, but will true friends make her happy?