I took a college course on testing back in 1967.
A lot of interesting things that I did not know.
First, multiple choice and true false are actually the most reliable means of testing. The least reliable is essay.
IQ tests have the highest reliability of any type in that whatever they test, the person will usually get the same or similar results from another test.
Essay type tests are extremely unreliable. They basically give the scorer carte blanch to give whatever score they want to.
IQ tests along with achievement tests are excellent predictors of academic success despite so many educators denying it.
I have read that graduate level exams like the LSAT measure intelligence.