Schulte tables are a traditional method for assessing attention and mental performance in children and adolescents. An updated version of the evaluation of data from the Schulte table methodology is proposed, along with the usual efficiency, mental stability and workability, the authors introduce an assessment of new parameters for the time of searching for numbers: fluctuation (the ratio of the sum of differences in absolute value between successive tables to the total cumulative time) and delta (the difference between the minimum and maximum time). The purpose of the work is to present new ways of processing results from Schulte tables and compare them with previously proven ones. The second basic purpose of publication is to normative data. Presented are survey data of 239 children and adolescents of the practical norm aged from 7 to 17 years (average age 11.9 years), students of secondary schools in Moscow and other cities of the Russian Federation, divided by age into groups 7–8 years, 9–10 years, 11–12 years old, 13–15 years old and 16–17 years old. Among them are 109 boys and 129 girls. The following main results were obtained: dynamic indicators of attention (ALL characteristics) are influenced by age characteristics, and not by gender differences; the influence of gender on work efficiency was found in the age range of 9–10 years. The indicators “Workability” and “Mental Stability” are approximately the same in all groups. Standards for all selected analysis parameters for 5 age groups of examined children and adolescents are presented as a practical norm.