Telemann's "6 Quadri" are likely instrumental pieces, possibly chamber works, demonstrating his prolific output and clear, contrapuntal style. They are characterized by their balanced structures and accessible musical language.
Focus on clarity of line and precise articulation in the contrapuntal passages.
6 Quadri is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 6 Quadri lasts about 25 minutes.
6 Quadri is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.