<p>Bassir, Well, I used Giancoli during my honors physics class and I don’t think it’s quite right for Physics C. It does not go into the Calculus involved with deriving the formulas (and this is important considering Physics C is Physics with a Calculus emphasis). It is good however to gain a basic understanding of all of the concepts.</p>
<p>I have LOOKed at Barrons for Physics C and it does go much more in depth. After reading many reviews for it and PR both, I found that the general consensus was that Barrons was not good if all you wanted was a 5 on the AP test, but is great if you want to know a lot of things that the AP exam will not even touch on. PR is simply meant to give you what you need to know for the exam. So if all you want is a 5 on the exam than PR is your book. But, as it seems in your case, if you want to actually learn physics and outside the scope of simply the AP test then get Barrons. To quote a review from Amazon:
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<p>Hope that helps! Good luck with your quest into physics!</p>