Juken is an activity of taking an examination to go to school in Japan.
Jun literally means “To take”, and ken means ” an examination” in Japanese.
Examiners are usually given writing test to make sure how eligible they are to study at its school or college after compulsory educational period, like elementary and junior high, has been done.
Unlike in western countries having entrance examinations all year around, Generally, the exams in Japan take place around every February, which is a couple of months before the beginning of the school period.
It might be exciting for you to see examiners having a look at lists of the name on the board in university to know whether he passes it or not.