The setting is that there is this other world that Earthlings are trying to colonize. Each nation has its own academy in a separate dimension preparing students for that mission, with Fighting and Magic majors. The MC is of course physically weakest and severely underestimated but of course has a cheat, an S-rank innate ability, something along the lines of being able to learn everything faster. He is somehow the head boy of the stream and everybody hates that. Rings a bell for anybody?