I have not read the book, but here's a review by a psychology professor.
www.sfu.ca/~wwwpsyb/issues/1996/winter/keenan.htm
I completed grad school in 1973 and have been working ever since. No one has ever asked for my IQ score. In my work as a rehabilitation counselor and vocational evaluator I see lots of reports containing IQ scores, but to me they are just one little piece of information. They are sometimes useful for establishing eligibility for one program or another, but they do NOT tell me what an individual has done so far in life or what they are capable of accomplishing. An IQ score certainly never gave me any insight into someone's motivation and desire to succeed.
I had a psychology professor, a successful professor, way back when who always claimed that he'd scored an 80 on an IQ test in high school.
John