Knowledge assessment is an important component of learning activity. To lessen teacher’s burden we intend to use machinelearning technique to evaluate the students’ knowledge level. In this paper, we propose a specific approach for knowledge assessment by analyzing students' behavior in learning activity. Another important aspect in our research is designing methodology for recommending correct answers to improve students’ knowledge level. This paper is the first report of a project on the use of machine learning in education, which we recently started.