Saint Saens concerto 2: etudes and/or practice tips?

[stooftheoof]

Hi Everyone - been benefiting from these posts for a long time, now have a question:

Do you know of any etudes, exercises, or other practice tips to help with the Saint Saens Concerto #2? Especially the first movement? My son is just getting started on this piece.

I found some tips in this thread, but that's about it: https://www.pianostreet.com/smf/index.php?topic=17805.0

Thanks!