I searched for to find official or high-quality preparation materials for the CILS C2 exam (the highest level of Italian as a foreign language, equivalent to near-native mastery).
Just reply: – and I’ll list them for you.
But be aware: many are incomplete or unofficial. I can’t download or host files, but I can give you the exact direct download URLs from the University of Siena’s website if you want (they are public PDFs).