I took the 2013 CFA AM exam this morning (did 2014 last Saturday) and a Schweser AM mock this afternoon. I think there’s a material difference. You’re majorly stressed for time on the CFA AM exam whereas I had plenty of time to finish the Schweser AM.
In terms of difficulty, I don’t think any single question is too terribly difficult if you know your stuff on CFA AM exams, but you’ve got to process the info very quickly. No time to waste at all. If someone had only prepared using Schweser mocks, I think they’d be in for a rude awakening on exam day for the AM.
In terms of quality of writing and questions, the CFA exams are a lot better. I understand why people have said in the past why the Schweser AM sections aren’t great prep. I think some of the quality of questions kind of suck on Schweser compared to the real CFA exams. Schweser’s PM seems fine, though. Maybe I’m just pissy b/c I did two AM mocks today but I don’t think the Schweser AM mocks are that good. Do the actual CFA exams if you want good practice.
Note: I haven’t taken the CFAI mock exams (multiple choice) yet so I can’t compare the two.