<p>Here’s a link to an online free version of SICP. It’s a great book, and 61A’s a great class; well worth taking. I’m not honestly sure how difficult you’ll find it (since I’m not knowledgeable enough myself to estimate that).
<a href=“http://mitpress.mit.edu/sicp/full-text/book/book.html[/url]”>http://mitpress.mit.edu/sicp/full-text/book/book.html</a></p>