A. I'll never be good at maths. I'm just too stupid!
5. negative feelings about themselves
B. 'I hate my voice. It's high one minute, low the next, then high again! What's the matter with it? AND the girls are making fun of me! I'm so embarrassed.
2. physical changes
C. 'I must get the highest score in this exam. I must be the best student in the class!
6. having too high expectations