Exam learning focuses on memorization because one will be forced to recall information without any cues other than the questions, and you have to adapt to the mark scheme’s strictness; bluntly speaking, it can get extremely tedious and tiresome really quickly. And also lots of past-paper grinding and eliminating mistakes through repetition. Much slower than when you are learning something for the sake of interest, at the very least, because there is no need to memorize literally everything in the syllabus for a test later!