What explains the persistence of high requirements for education during the Great Patriotic War?

Due to the fact that a huge number of the intelligentsia was destroyed by order or default of I. Dzhugashvili, there is no need to talk about the high requirements and level of training of future engineers, teachers, military personnel, and medical workers. There were absolutely insignificant numbers of people who survived the repressions and could teach qualitatively. The seizure of a significant area of ​​the USSR by Germany, huge losses during the retreat and a shortage of personnel at the front did not contribute far to the quality of training. Pilots and tankers graduated from crash courses and went to the front. Medical assistance was provided by yesterday’s primary school teachers and musicians. A scanty part was made up of people who had combat and other experience since the time of the 1st World War.