Bu Allam teaches music and goes to replace teacher Hayat in a high school; however, he is surprised by a student who can sing opera.
Mustafa helps the students with a pop philosophy quiz, and the professor sees him, takes the paper from him, and gives him an F grade.
Bu Allam teaches the musical scale, and Mustafa does not know the treble clef. On the other hand, Sansouna sings the entire musical scale.
Fateh gives an exam to the students in the Arabic language and expels Galhm for seeing him cheating.
Fateh offers the students another opportunity and gives them an exam titled "Whoever Cheats Is Not One of Us". He also gives them the freedom to cheat or not, so Bilal decides not to cheat and quarrels with Hisham.
Fateh admonishes the students for cheating in the exams and gives them a lecture on conscience. He also saves a student from breathing difficulty.
Bilal's pen runs out of ink while writing a geography lesson, so he borrows Murad's pen and takes the ink from it.
Bu Allam asks the pupils to sing a traditional song and try to feel a sense of belonging instead of the new songs that have no purpose.
The teacher rejects the noise during the English exam and then discovers that Bilal is cheating. However, Maria seizes the opportunity to eat sweets without the teacher seeing her.
Fateh chooses Bilal as the head of the class after a toss between him and Murad, and Bilal is happy with the task.
As the students watch Miloud, the math teacher, Bilal goes to buy sunflower seeds for his friends after making a bet with them without the teacher seeing him.
The students change their hairdos, and Bilal appears with a strange hairdo. Fateh blames them and asks them to respect the educational institution.
Bilal agrees with his colleagues to surprise Sansouna and celebrate her birthday in the department in the presence of Fateh, so Sansouna is very happy because her colleagues remember her.
Fatiha tries to stir up trouble between Gilani and Mustafa, which leads them to agree to fight after the Arabic class.
Mostafa and Gilani go to the principal because of their fight outside the class, then they reconcile in music class thanks to Bu Allam.
Miloud threatens the students with dropping a point if they speak in the class, but he backs down as soon as he receives a phone call, so Bilal tells the students that the teacher has received his salary.
The students refuse to enter the section because of its bad smell, so the teacher and the principal insist on continuing the class and search for the student who put the cheeseweed plant in the class.
The principal asks Bilal and Mustafa to clean the class from the cheeseweed plant. Bilal's mother, who works as a cleaner at the school, asks Bilal to clean the class instead, but he refuses, fearing that his classmates will discover that she is his mother.
Mustafa tells Miloud that he has learned from Bilal that the students of the economics class have put the cheeseweed plant in the class to make the students sick.
The students of the economics class threaten to beat Mustafa for telling the principal that they were the ones who put the plant in the class, but Sansouna defends him and beats them despite her disability.
The English language teacher yells at Eman, and the students protest against her and refuse to complete the lesson until the teacher asks for Eman's forgiveness.
Bu Allam hands the report of the marks to the students, so they get happy and sing in celebration for obtaining high points.
Fatiha prepares pies on the occasion celebrating the end of the school year, which is attended by the principal, who likes the party and wishes success to the students.