<p>Does I help to use all the prep books you can get your hands on,
does it hurt your score, is it over kill?</p>
<p>What I suggest doing is using one prep book that is most recommended to cover all the information and give the most accurate practice tests.</p>
<p>use one prep book to PREP. but there’s no harm in using all to PRACTICE.</p>
<p>I’d say use all of them, at least for the practice tests if nothing else.</p>
<p>it helps as some topics are not covered in your high school course. it depends though. Hence, practicing more helps.</p>
<p>Thanks for the help</p>