I beat them and I'd say that the second one was a bit rougher than the others, the main annoyance being her massive health pool and 1500 heal. Lactobacillus (which is a name I was not expecting to see here lol) hit hard but at least I could 2 shot him.
Lactobacyllus has 3k hp, the lactomancer has 10k. She has much more health than him, because she's actually using the third examiner's HP stat instead of the her own...oops. My bad!