in elementary, middle, and my first year of high school, we were required to take this computerized test called the MAP test 2 times every school year (one for each semester).
usually kids hated it but i loved it because i was actually pretty good with it.
the way it would work is if you continued to get right answers, the questions would get harder. and vice versa. there would be around 42 to 58 questions (42 questions for english and 58 for mathematics)