It depends, of course, on context but in some usage you would find "Student Book" as the term used by publishers that refers to the text (book) used by/for students and usually accompanied by a "Student Workbook". "Student's book" would refer to any book belonging to or intended for a particular student. Another form could be "students' book (one book used by all students) or "students' books (all books used/owned by all students).

Student or Learner