Answer: Working self-concept.
Explanation:
Working self-concept is defined as activation of self perception due to exposure towards any event or experience that signifies than an individual has certain circumscribed personal information about their own-self in terms of characteristics, thought , abilities,etc.
According to the question,Anton is also signifying working self concept.He though that he is intelligent in math but after getting exposed to other students in calculus class he got to know that other students are exceptionally intelligent and smart.
Thus,after realizing this situation ,Anton immediately created a self perception about himself.