Elementary Chemical Influences has complicated math in it that you are presumed to already know.  Nastily Exhausting is about prepping for the wizardry tests you'll get in the first year of a particular wizard school, and is written in an relentlessly peppy style which never really backs up and explains anything and instead exhorts you to do well on particular kinds of problem.

Elementary Chemical Influences has complicated math in it that you are presumed to already know.  Nastily Exhausting is about prepping for the wizardry tests you'll get in the first year of a particular wizard school, and is written in a relentlessly peppy style which never really backs up and explains anything and instead exhorts you to do well on particular kinds of problem.