I took the exam last October and it's not as hard as these questions. These questions are good and make you really think and know your stuff. Some are very on point but some are much harder than the real DAT. Maybe it has changed since I took it, and I do read peoples post about their exam and some say biology has gotten harder and some say it was pretty much equivalent to previous time they took it (people who retook the exam). However his biology test 2, which I took like 2 weeks ago, i honestly believe it's like 95% on point. Like really on point, so if I was you I would definitely take his biology 2 exam he posted like a month ago.