I don't know the name of a school novel

At first, it was said that the protagonist was not outstanding in the school. Later, an alien creature was stored in his body, making him very extraordinary.(I remember when he was in class (I think it was the third year of high school), he was called by the teacher to answer an English question. The protagonist was taught by the alien organism to answer correctly. It seemed to be the only correct question in 3 years. The alien creature said: The female lead is a beautiful class monitor who is in the same class as the main character in high school. She started dating in the third year of high school and later went to the same university as the main character. It seems that in the middle of the story, the female lead and the male lead had a small conflict. The main character took the first place in the school during the college entrance examination. Later, it seems that the main character started his own business... The protagonist's beauty seemed to only be that beautiful class monitor… The author seemed to be in his third year of high school when he first wrote it Friends who know the name of this novel, please tell me the title. thank you The novel is not foreign, it's domestic