Scriabin's 'Allegro de Concert' Op. 18 is a fiery and emotionally charged work from his early period, showcasing his burgeoning harmonic language. It is characterized by its sweeping melodic lines and dramatic, chordal passages.
Developing the necessary power and control for the large chords while maintaining a singing melodic line is a significant challenge.
Allegro de Concert (Op.18) is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 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 Allegro de Concert (Op.18) lasts about 6 minutes.
Allegro de Concert (Op.18) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.