According to the decree of the Czech Government, presence on school exam is limited to 10 individuals.

With a valid exception:

According to the 1st point, subpoints a) and c).

     a) Participation in clinical and practical teaching or practice of medical field students (general medicine, dentistry, pharmacy and other) and pedagogy field students carrying out practical teaching or practice within their study plan.

     c) Participation in individual consultations (one student and one consultant).

According to the 3rd point, subpoint f):

     f) Participation in exams up to 10 individuals at higher vocational schools (in Czech Vyšší odborné školy).

Full text of the decree (only in Czech).