<p>I self-studied both last year and scored a pair of 5s. The 5 steps books is very, very good and it is easy to get for free. I bought the Princeton Review as well but I didnt think it was that great. </p>
<p>In terms of textbooks, Krugman’s AP Macroeconomics, or Mankiw’s Book (which is the same thing as Krugman’s + Micro), will get you fives easily. </p>
<p>If you have any other questions just PM me, I had a lot of fun doing this last year. </p>