"Damn it, what the hell is the guild doing? They should be regulating this!!"
Yeah, they should. And that they don't is kind of an egregious plot hole, especially considering they hired a clan that is affiliated with two of their examinees (one of whom they already paid special attention to) as helpers. Are there no background checks at all?
They put a tail on Claus, observing him for quite a while, but these guys, who obviously hold an unreasonable grudge against him, go unchecked, completely ruining the exam. I can hardly fathom this amount of incompetence.