Preparatory classes are a form of mandatory training for children of senior preschool age. They were established due to a number of reasons, but above all, because of massive closing of preschool organizations, which in 1995 to 1999 resulted in absolute majority of children’s entering primary schools not having achieved the required level of general personal development, and not having been prepared for studying at school in terms of psychological, cognitive, and general cultural background. Most of those children, when they found themselves in a new situation at school, felt uncertainty when orientating in the environment. Such first-grade pupils’ unconfident behavior caused their classmates’ negative emotions, which, of course, hurt their mentality and aroused unkindly attitude even on the part of the teachers. For that matter, in 1998-1999, Kazakhstan Ministry of Education & Science, in terms of preparing the draft Law “On Education”, initiated the working out of a new regulation on mandatory, free preparation for school for 5 to 6 age children in government-owned education institutions in terms of comprehensive education program, so called PREPARATORY CLASS.