What does Studententien mean?

"A studententien, but I passed," he said, relieved about his grade.

Dutch student slang. This is a Dutch word. You will hear it a lot at Dutch universities, student associations and in student houses.

Dutch grades go from 1 to 10, and a 5.5 is the lowest pass. Not a high grade, but you get your credits. After a hard exam that feels like a perfect ten. Hence the name. Also read about tenta, her, nominaal lopen and GPA.