If we're talking about "Genius" this would fit the category. He's medical examiner who specializes in rare diseases. He assists with crime cases suspected of involving perpetrators with rare conditions, and offers plenty of unique medical insight while teaching viewers a thing or two about a few rare diseases.
If you love the crime school type of genre or just want something REALLY SIMILAR to Extracurricular, I really recommend Bad Genius. Bad Genius is about a group of students who make money by cheating on test. It's also really good if you love suspense. Bad Genius also has a drama remake which was inspired by the movie.
A movie that focuses on the Thai education system and the lengths students will go through to ace a test that will get them scholarship and enrollment in the top universities around the world. A thought provoking, dark film which explores rights and wrongs of education and the morality of students that will keep you at the edge of your seat with your heart racing from start to finish. Is semi based on real cheating scandals based throughout Asia and Southeast Asia - specifically one based in Thailand, which also happens to be the film's country of origin.