Hello all. I am a repeat MCAT offender (taker). After getting a 27S the first go-around, I figured on retaking. My question is if purchasing the Audio Osmosis set is justified to supplement the EK Complete Package. It seems sort of spendy if not needed. I have heard pros and cons on Amazon.com. I plan on following the EK 10 week "program" diligently to prepare this go-around (compared to willy-nilly last time). Thanks all!