Mozart's K. 576 sonata, often referred to as the 'Gramercy' sonata, is one of his final and most technically demanding works for solo piano. It is celebrated for its brilliant passagework, intricate harmonies, and lyrical depth.
Achieving a sparkling articulation and effortless command of the rapid figuration is paramount.
3 Keyboard Sonatas (Op.6) is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of 3 Keyboard Sonatas (Op.6) lasts about 30 minutes.
3 Keyboard Sonatas (Op.6) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.