Asking PISA-Questions to Bachelor students

The Programme for International Student Assessment (PISA) is an internationally standardized assessment to 15-year-old pupils in schools. With the same purpose, the questionnaire made by Dr. Duller (Austria) was conducted at the university Humboldt, Berlin. We would like to assess how good students are at mathematics and statistics. Which part is the most difficult problem for students? What can we do to improve it? Factor analysis will be done in SPSS and Mplus to consider relationships between questions.