If you're searching for something similar to 'Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e,' I'd recommend diving into 'Classroom of the Elite.' It's got that same intense psychological warfare and strategic mind games between students, but with a darker twist. The protagonist, Ayanokouji, is just as calculating as the ones in 'Youkoso,' but the setting feels even more cutthroat.
Another great pick is 'Oregairu' (My Teen Romantic Comedy SNAFU). While it lacks the high-stakes competition, Hachiman's cynical worldview and the way he navigates social hierarchies scratch a similar itch. The dialogue is sharp, and the character dynamics are layered, making it a satisfying read for fans of complex interpersonal drama.
For something with a more action-packed edge, 'Mahouka Koukou no Rettousei' might appeal to you. Tatsuya's cold efficiency and the elitist school environment mirror some of 'Youkoso's' themes, though it leans heavier into sci-fi and magic systems. It's a fun blend of power fantasy and intellectual maneuvering.