Raskina I.V.

Carlson opened a school, and on September 1, in all three first-grade classes, there were three lessons: Taming, Degrading, and Fooling Around. The same subject could not be taught in two classes at the same time. Taming in 1B was the first lesson. The Fooling Around teacher praised the students of 1B: "You are doing even better than 1A." Degrading was not the second lesson in 1A. In which class did they fool around during the last lesson?
From the condition, it follows that the Fooling Around in class 1B was either on the second or third lesson. Let's assume that it was on the second lesson. In 1A, it was earlier, so it was on the first lesson. Since the Humiliation on the second lesson was not in 1A, it was on the third lesson in 1A. Since the first lesson in 1B was Taming, Humiliation there could only be on the third lesson. Contradiction. Therefore, Fooling Around was on the third lesson in 1B.

## Answer

In 1B.