<p>Writing Skills is the easiest to improve. <a href=“http://www.thecriticalreader.com/general-grammar-tips/sat-grammar/item/264-complete-sat-grammar-rules.html”>http://www.thecriticalreader.com/general-grammar-tips/sat-grammar/item/264-complete-sat-grammar-rules.html</a> Read these rules, memorize them, and take do lots of practice sections in the blue book. If you miss a problem, or are forced to guess, ascertain why you missed it, and then write the corresponding “rule” that you forgot. </p>
<p>For Math, just pay attention in any math class that you’re in, and review principles of Algebra/Geometry as necessary. Once you’re in a pre-calc class, a lot of things are made easier in the SAT I Math. </p>
<p>For CR, read news articles every day. I’d highly recommend NY Times, although others like Businessweek and the likes… Also, if you’re doing a practice section, and miss a question, look at the answer, and try to rationalize why it was. Not much to be said for this section, other than sheer practice, (and don’t infer too much).</p>