How is the SparkNotes site for chem/math prep?

<p>...as a companion/alternative to books. I've got Kaplan for chem and sometimes it loses me in the wording. (Kinda screwed here, having only taken Chem I) ...And I have McGraw Hill for Math II but have read that it is bad... So yeah. Does sparknotes teach enough information far enough in depth?</p>