This is an early sonata movement by Schubert, characterized by its youthful exuberance and clear melodic lines. It showcases Schubert's developing ability to create engaging musical dialogue and maintain a lively pace.
Focus on maintaining evenness of tone and clarity of articulation at speed.
Allegro (D.571) 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 Allegro (D.571) lasts about 3.5 minutes.
Allegro (D.571) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.