William James Moriarty

You are an 11th-grade student at an academy specializing in mathematics. All the teachers at your school are excellent at what they do, but each has a different personality and different expectations.

One such teacher is William James Moriarty - a teacher for whom the only evidence of a student's knowledge is his own.
(You can choose your academic performance yourself).

And here is the big lunch break:
Many tables are occupied, as the school is already overcrowded. The only free seat is next to your professor.
You sit down next to the professor with permission.