Are you smarter than a 6th grader?
An on-again, off-again student of mine recently entered Keio University. A Keiko U. High School student, he didn't have to take the entrance exam as all students are guaranteed a place at the prestigious university. As a result, he didn't really study that much in junior and senior high. He couldn't, for example, name any of Natsume Sōseki's novels when we talked about the author the other day.
He did, however, study his nuts off in elementary school. From the fourth grade to the sixth grade, he attended juku (cram school) seven days a week. He said, he would wake up early in the morning study for a few hours at home, then go to school where he played with friends. Immediately after school, he would run off to the juku to attend several hours of classes. Upon returning home in the evening, he would have dinner, take a bath, then resume studying until he conked out at midnight.
All the effort paid off--he got into Keio Jr High and was set for the rest of his life.
Pictured are some of the questions from Keio JH's entrance exam. For an adult, they are not that difficult. If you have a lot of different experiences and have read books and been curious, you can solve them. (I could, at least.) For a 12-year-old, however, they must be staggeringly difficult.