It should be noted that theeffectiveness of the tests, conducted immediately after the lesson, is higher than that of those doneat the next lesson, which corresponds to the specifics of the cognitive development of students withintellectual disabilities, that is, they are characterized by low capacity for long-term memorization.The average trend of the test results is characterized by significant jumps from higher to lower, andvice versa, at each subsequent lesson. Besides the test results shown in Figure 8, indicate aconsiderable variation of the minimum (from 0 to 5 points), and the maximum score (4 points witha predominance of 8 points).