NCLEX difficulty level April 2011 changes

Hi everyone. I recently graduated in August 2011 and I'm taking the NCLEX PN here in a couple of weeks and I saw a post on here recently that got me thinking (post about the exam changing every 5 years or so). While I was still in school I took an NCLEX review class offered by my school. The instructor for the class told us about how the difficulty level of the NCLEX for both RN and PN was increased in April 2011. She mentioned that the NCLEX PN went from a difficulty ranking in the 37th percentile to the 27th. I'm just wondering if there is anyone out there that happened to take their exam before April and then again after April if they noticed any differences in the exam. I just keep wondering if this instructor really knew what she was talking about or if it was a scare tactic.