The third movement of the Bachianas Brasileiras No. 3, often referred to as the 'Toccata', is a virtuosic piece for piano that synthesizes Brazilian folk melodies with Bach-inspired contrapuntal writing. It is known for its rapid figurations and demanding technical passages.
Developing evenness and clarity in extremely fast arpeggiated and scalar passages while maintaining rhythmic drive is the central technical challenge.
Bachianas Brasileiras No.3, W 388 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.
A typical performance of Bachianas Brasileiras No.3, W 388 lasts about 10 minutes.
Bachianas Brasileiras No.3, W 388 is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.