These sonatinas represent Mozart's early compositions, offering glimpses into his developing genius with graceful melodies and balanced structures. They are excellent examples of the Classical style in a concise format.
Focus on clarity of articulation and evenness in scale passages and Alberti bass.
6 Wiener Sonatinen is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
6 Wiener Sonatinen is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.