i was shocked to see that i passed my history class with so little effort and studying you must be really good with reading comprehension and remembering facts . congratulations . i wouldnt say as much as the fact that ive had american history like 4 times before because of highschool and middle school so you 've retained all of that info and recalled it from memory during the test . i was never a good history student .
The cause: Repeatedly studying the same subject (American history) multiple times.