The research results clearly support the conclusion that data mining is generally not limited to large data sets as the majority but not all of the authors and previous research anticipated this finding. Specific use of data mining techniques for structured small data set can also serve the usable results. Data mining for small student data sets from research is relevant example of effective use of data mining technology to develop the HEI’s knowledge management systems in the education domain. In the past, there were several attempts to predict the student educational success with various successes. The research focused on small student data sets and the results were obtained by comparable using of two different data mining technologies (Microsoft and Weka). Both results show a relative high prediction success and thus strength the conclusion that they can be relevant tool for developing HEI’s knowledge management systems as a main contribution of the paper.