This movement from Mozart's Piano Sonata in G major, K. 497a (likely a movement from a sonata for four hands, this piano arrangement is often studied), is a quintessential example of Classical sonata form with its balanced phrases and clear thematic material. It demands a light touch and clarity in execution.
Master the seamless transition between Alberti bass accompaniment and melodic statement.
Allegro in G major(K.497a) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Allegro in G major(K.497a) lasts about 4 minutes.
Allegro in G major(K.497a) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.