I like that other apprentice. It's presently unknown if she's trying to get rid of Coco or perhaps using truly Spartan methods to force Coco to become a proper apprentice witch. Since Coco is the MC, it's unlikely she would fail, regardless of if it's true you can only try once and it wasn't only something Agete said to make Coco take the test seriously. So, let's say Agete thought Coco has a 20% chance to succeed (if 10 year olds can do it, it can't be super difficult), but if she pulls it off, it would instantly fix her attitude and problems, so it would be worth it. If she fails, nothing's lost as it would mean Coco didn't have what it takes to be a witch. If Agete only did this to get rid of Coco, I also wouldn't mind. Such things drive MCs forward, and in the end it's an ugly dog eat dog world. The sooner Coco learns that, the better.