ACT curves for practice test

<p>I have been taking practice tests from the ACT (official), Kaplan, and Princeton Review. My question is do I trust the curves in the book or the curve attainable on the ACT website? The differences can be major:
Kaplan Test 1 : 28 on kaplan curve 32 on official curve
Kaplan Test 2 : 30 on Kaplan curve 34 on official curve
Princeton Review : 32 on their curve, 33 on official
Act Preparing 2014 : 33
Based on this information what curve would probably be more accurate? Would it be reasonable that I could get a 32 on the real thing?</p>

<p>Te curve in the red book is official, as it’s a real test. The curve canges for each test</p>