Johann Baptist Cramer's Op. 37 sonatas are representative of his significant contribution to the piano repertoire of the Classical era. They are noted for their melodic clarity and well-structured forms.
Requires a refined touch and clear articulation to bring out the contrapuntal elements.
3 Piano Sonatas (Op.37) 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.
3 Piano Sonatas (Op.37) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.