Sample Level III Item-Set Questions

has anyone taken this ??

Directly from the CFA website. Is the test really going to be this hard? Everyone told me to concentrate on the essays. I’ve done ok on them, barely passing the 2008-2010 exams and the entire Schweser Mock. This problem set was a real wakeup call, however. I got in the 50s! Obviously thats not good enough by any measures but am I the only one struggling with this problem set?