Maybe you'll like this link:https://www.pianosociety.com/cms/index.php?section=631I particularly like in that how it is explained how all the etudes are interrelated, I thought it was a good approach so I started with op 10 no. 1,2,3,4 and I'll look forward from there. The first four are pretty difficult, I think no.4 might help me to play no. 12 for example.