What does Her mean?

After a fail she had to prepare for her her in January.

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

A her gives you a second chance at an exam you didn't pass the first time. Usually a few weeks after the original exam. Confusing for English speakers, because "her her" is a real sentence in Dutch student life. Also read about tenta, studententien and BSA.