麻烦帮我翻译几个词语

翻译:院学生会学习部副部长
Vice Leader of Learning Department in College Student Union

翻译:年级学生会学习股股长
commissary in charge of studies in Grade Student Union

翻译:优秀干部
excellent leader

翻译:三好学生
three good student(good in study,attitude and health)

SIT的全称?(学校要求学生参加的工程)
一般是导师制，不知你们是什么

The Sailing Instructor Trainee program (S.I.T.) is a workforce development program with additional character-building components.