<p>I’ve started working through the Blue Book, and I usually only miss 3 in each Math section, but on one section, I only missed one. However, the problems that I do miss are almost always probability problems or the miscellaneous problems (example: WXYZ is an integer. If W = blah blah blah etc., then what is WXYZ?). What is the best resource to practice for these two types of questions?</p>
<p>I like the Barron’s math workbook (ISBN: 1438000286). The problems are broken up by type and can get rather difficult, and the explanations are comprehensive. Probably only about 15-20 questions per type though.</p>