I didn't find the organic chemistry too hard, but perhaps that is because my father is an organic chemist. The book I am reading for organic chemistry is Organic Chemistry by Morrison and Boyd. However, I quickly found that the text is too advanced for what I can see on the nationals test. After the first 4-6 chapters, there seems to be nothing else. Is there any way we can find material covered in the camp online?
The Atkins book I bought for 15 dollars (hardcover, textbook style and all). Linus Pauling's book I also have, and it is in a very different format, at least for me considering I have looked through only introductory high school texts. It takes a (very?) mathematical approach into subjects such as thermodynamics and properties of gases, and it devotes many of its chapters to specific elements and their properties in compounds. My impression of the book is that it is indeed hard to read, and the mathematical aspects, while interesting, seem not useful at least for our interests.