<p>I think that what you are looking for is something that may be spelled out in a high school handbook but is perhaps implied in a collegiate setting? If you look at the section dealing specifically with graduate TAs, the following may apply: </p>
<p>Responsibilities of Teaching Assistants:
Graduate teaching assistants have considerable influence on students’ learning in a course or laboratory. In addition to an obligation to maintain high standards of academic honesty and integrity, graduate teaching assistants should assume the following responsibilities:
GTAs are expected to prepare sufficiently for each class so they can meet, with confidence and resourcefulness, the questions and needs of students.
GTAs are required to hold regularly scheduled office hours outside of class if teaching undergraduate students. Office hours should be conducive to the schedules of undergraduate students.
GTAs may create situations in which their private or personal interests are potentially in opposition to their official responsibilities. A GTA must be sensitive to the potential for conflict of interest situations and act in a manner to minimize the situation’s effects. GTAs with concerns about potential conflicts of interest should confer with their faculty advisor or department chair.</p>
<p>I’d suggest contacting the department head if you have a concern. I believe they would be the appropriate contact.</p>