The Irregular of Magic High School Vol 4 Light Novel

The Irregular at Magic High School by Tsutomu Satou. An Action light novel rated Teen, published in English by Yen Press.

At First High, students are split into elite "Blooms" and second-rate "Weeds" based on their magical ability. Tatsuya Shiba is a Weed, while his sister Miyuki is the top student of their year, but Tatsuya's true abilities are far beyond anything the school's tests can measure.