Background and aims: An important issue of teaching and learning processes is how to assess and develop students’ cognitive abilities. The aim of the study is to examine the correlation between in class 5 and 8 class measured skill levels' attention, memory, and thinking. Assumption: The correlation is between the pre-tested skills level and the post-tested skills level in the pilot group. The students with better skills have developed better during testing than the students with lower skills. Method: During the survey, I monitored the progression of students brought under a group (n=174) who in development activities took part in 4 years. The follow-up of the participants' memory, attention, and thinking was done with tests known in talent management. Results: There is a strong, positive correlation between attention, memory, and thinking. Discussion: The strong positive correlation indicates that the students with better skills show greater development than the students with lower skills. The initial benefits appear in point of the chance of development.