Cramer's Op. 96 Preludes are pedagogical works designed to develop fundamental piano technique and musicality. They offer a variety of expressive challenges in a clear, Classical style.
Focus on developing precise articulation and a balanced sound between the hands.
24 Préludes (Op.96) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 5.
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 24 Préludes (Op.96) lasts about 45 minutes.
24 Préludes (Op.96) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.