Schubert's Ecossaises, D.421, are delightful and characteristically spirited short pieces that capture the essence of this popular dance form. They are known for their clear melodic ideas and energetic, often virtuosic, piano writing.
Focus on rhythmic precision and maintaining a light, agile touch throughout the quick passages.
6 Ecossaises (D.421) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 6 Ecossaises (D.421) lasts about 5 minutes.
6 Ecossaises (D.421) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.