These are methodic etudes designed to systematically build technical proficiency, often featuring imitative counterpoint and clear melodic lines.
Focus on crisp articulation and evenness in fast passages.
3 Trietti methodichi e 3 Scherzi is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6.
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 3 Trietti methodichi e 3 Scherzi lasts about 3 minutes.
3 Trietti methodichi e 3 Scherzi is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.