Kasumi would likely take to the tests the most easily, able to solve them with both speed and precision. The tests themselves would likely not faze her at all, GlaDOS would have trouble talking her down but she might be able to break her if she found the right trigger.
Kumi would think hard about the tests before taking action, trying to come up with the most logical solution and not listening to GlaDOS as she would know that it's only a distraction trying to keep her from solving the tests. GlaDOS would be unable to get into her head, but the seemingly endless tests might overwhelm her eventually.
Yuri would have it the worst, she would be too freaked out to actually think clearly and GlaDOS would be able to get into her head rather easily, she would have a breakdown rather early in the tests most likely.
What if the girls lived in the Attack on Titan world and Yuri was Eren's little sister?https://en.wikipedia.org/wiki/Attack_on_Titan