This Etude #12 exposes flaws in your fundamentals and intonation like very few etudes I’ve ever seen!  And, if you can get to the last couple measures, they are super painful after everything you’ve been through throughout the etude.  This is a great one to have your tuner on in such a way you can see it while playing.

note: the last measure of the third line page 2 I think should be an A natural.  That would follow the diatonic pattern.  I marked it in my part attached to this post so you can see what I’m talking about.