It's a huge expense. Why don't you first try reading the berkeley review physics and chemistry. I heard NOVA physics is also good. It's worked for me as my hardest section is PS.
i have all the books, tbr and ek and nova, but it takes a lot of effort to study and study those and try to understand everything. i come home everyday tired from work so i'd like some motivation and something more interesting than reading a book? anyone else???
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