on the exam 为什么不能用in the exam?

on the exam 为什么不能用in the exam? on the exam和in the exam区别在哪?还有是cheat on the exam 还是in the ex in exam 和in the exam区别 in the passing exam 还是 past exam The exam comes in July fail in the exam fail the exam区别 请问on the final exam与in the final exam有何 区别,有道理我会追加分的, He made the [ ]mistakes in the exam. came first in the Maths exam 同义 Madee comes______(first) in the Chinese exam. Tom s____ in passing the final exam. Som scored ___points in the exam