High school mathematics knowledge level of technical university students

[EN] The lack of knowledge of high school mathematics is one of the key problems for students at technical universities. They face this problem not only right after entering the university, but they fight with this handicap during their whole studies. In the first part of this paper, we introduce the results of the questionnaire survey among first-year students which consists of the comparison of their subjective opinion on the level of their knowledge with the true results of the entrance test. The second part of the paper is dedicated to our new online courses of high school mathematics for our students. We believe that our effort will become an effective way how to supply the students with the knowledge, which they should already have and which is expected for further extension in regular university courses.