This is a variant of the chorale prelude "Ach Gott und Herr," likely an earlier or alternative setting of the same hymn. It maintains the contrapuntal rigor typical of Bach's chorale works.
Focus on clear articulation and a consistent, stately tempo through the contrapuntal lines.
Ach Gott und Herr (BWV 692a) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 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.
A typical performance of Ach Gott und Herr (BWV 692a) lasts about 3 minutes.
Ach Gott und Herr (BWV 692a) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.