This is a collection of sacred vocal pieces. Its musical distinctiveness lies in its devotional character and the interplay between the different motets.
Focus on maintaining a clear contrapuntal texture and appropriate expressive qualities for each work.
Ave verum corpus - Vocal Score is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
Ave verum corpus - Vocal Score is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.