<p>No, I don’t think Twilight available online for free; it’s still under copyright. You can read excerpts of it in variously places but not the whole text. There’re chapter-by-chapter summaries of the series at Twilight Lexicon, but reading them beforehand may ruin your experience of reading the books themselves. Also there’re chapters available from Midnight Sun on Stephanie Meyer’s website that you can download for free.</p>
<p>I absolutely love the Twilight series, of course, but I feel that reading it does not help much with SAT CR. If you’re looking for books that will provide you solely with the pleasure of reading then go right on ahead, it’s an extremely engaging book. However, if you’re thinking of rapidly improving of CR skills, like you had mentioned in the original post, then focus on classics like the Heart of Darkness first because those are charged with SAT words and offer a lot of good essay examples that may become more helpful during the SAT.</p>