A number of conditions in the classroom can influence how many students fail Danish and mathematics in 9th grade.
Two adults in the classes, lessons that take place after lunch, and teachers who are themselves trained in the subjects they teach.
There is much evidence that these are factors that can increase the probability of 9th grade students passing the final exam in Danish and mathematics. Conversely, many substitute classes and high staff turnover among teachers can pull in the other direction and reduce the probability that students will get at least 02.
