How to handle a student who will not accept that he is wrong? I am a university marker TA, and after midterm exam I met with a student who would not accept that he was wrong. He thought his answers were correct but didn't explain to me why his answers were correct. He just didn't accept my explanation. He also blamed me marking his assignment wrong, but later I found out it has nothing to do with me. It is my first time being a TA. Should I just tell him to talk to the instructor, and that my job is just marking?

Actually, I didn't explain too much because I don't know how to help him understand he is wrong even though he read the sample answer. And he didn't tell me why he is right.
Should I just tell him to talk to the instructor, and that my job is just marking?


Yes.  There's no point in getting into an extended argument with this student.  The student thought his answers were correct and you explained why they were not correct.  Since you've denied the student's appeal of the grade, the next appropriate step is generally for the student to appeal to the instructor.  

It's a good idea for you to warn the instructor that the student is likely to appeal the grade and to provide whatever information you can (such as a photocopy of the marked up exam question and any grading key that you used).