These are 18 year old children man. When I was like 14 I still told people I wanted to major in medicine.
Of course no exam in highschool is reflective of your capabilities of getting into medicine but forgive his naiveness.
My AP biology teacher asked us to read every page of the campbell reece biology textbook , never taught, and told us that professors wont lecture us in college, so we have to be prepared (come to think of it almost every class in college is titled LECTURE). I came into college scared that I would have to read the book, never did.
Same with this guy, hes probably being told that if he does bad in sciences on an exam it will ruin his science career.