A Warlock's Wish

In the midst of capturing a magical creature, Merlin is transported to a world where Camelot is home to thousands of magic-users. Merlin plans to get back to his own reality. To do that, however, he must get inside the castle. The only way in is to pass the Apprentice Exam and be an apprentice to a magic-user inside Camelot court. Should be easy...right? Full summary inside.