The purpose of the simulator is to help students prepare for criteria-based assessment. A variety of exercises presented in the simulator provide a comprehensive development of various types of memory, attention, observation, imagination, form non-standard logical thinking, develop the cognitive and creative abilities of first graders. The teacher can use the tasks of the simulator to draw up criteria-based assessment. The simulator is recommended for parents to train and test the child's knowledge, as well as primary school teachers as an additional material for optional and circle work.