Mozart's variations on the Dutch song 'Laat ons juichen' are a delightful exploration of a simple theme with his characteristic grace and inventiveness. The variations range from elegant lyricism to spirited virtuosity.
Achieving clarity and precision in the faster variations while maintaining Mozartean elegance is important.
8 Variations on 'Laat ons juichen' (K.24) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
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.
A typical performance of 8 Variations on 'Laat ons juichen' (K.24) lasts about 6 minutes.
8 Variations on 'Laat ons juichen' (K.24) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.