<p>About a year ago, one of the parents on CC recommended the Thinkwell Calculus CD. I purchased it as a study aid for my D, who was taking Calculus AB. Once she decided to actually view it, she found the CD really helped explain concepts she didnt understand and that it was a useful tool for test preparation. She had a great calculus teacher last year but she also really enjoyed the professor on the CD. She ended up loving Calculus, finishing the year with an A in the course and a 5 on the AP exam. So, thanks so very much to the person who recommended the product (sorry, I cant remember who it was). She is now taking Physics C AP and I was wondering whether anyone could recommend a similar product to help review or clarify topics?</p>