Year One by Sophie Lark. This is the first book in the Kingmakers series.
 
Genre: Dark romance
Pages: 432 (paperback)
Spice level: 1.5 out of 5 peppers ️️️
 
Themes and tropes: 
🔪Mafia romance
🔪Mafia heirs
🔪Friends to lovers
🔪Love triangle
🔪Dangerous school
🔪Trials
🔪Forbidden love
 
Blurb:
Leo Gallo (son of Sebastian & Yelena)

Mafia families from around the world send their children to Kingmakers Academy to learn the skills of criminal enterprise.

Under the rules of Sanctuary, students are forbidden to fight or kill. But rivalries are high, tensions inflamed, and forbidden love arises in the most unlikely places…

Welcome to Kingmakers.