Are the scaled scores from Kaplan/barrons accurate? Bio and Chem

<p>I’m using Kaplan for bio and Barrons for chemistry.
According the kaplan, you can miss 10 and still get a 760.
According the Barrons, you can miss 10 and still get an 800.</p>

<p>I’ve been getting around -10 plus the -2.5 on both tests… </p>

<p>which worries me since -10 is so much.</p>