Normalization to Third Normal Form (3NF)
I feel that you could add an additional Entity in there, one that represents people as a part of this (school-like?) institution, call it "People" (yeah...)

So Tutors, Students, Teachers, Head of Departments, etc are all People.
That table will hold Attributes that the sub classes/entities will share (because they're all people, right?): Firstname, Lastname, DoB, etc.

You then refer to this table on your other entities. Eg the Teachers by using the FK PeopleId (or whatever you call it =)

A student is then able to become a tutor and even a Teacher or a Head of Department at some point without being added to simultaneous tables within the database.

To, then, define a relationship between your Course, your Students and your Tutors you'll use a junction table in between that could look like:

------------------
|  CourseTutors  |
------------------
| FK | CourseId  |
| FK | StudentId |
| FK | TutorId   |
------------------


Thats very granular, it will even allow you to have one tutor per student.