Features IQ test and also a speed IQ test. Also exercises to work the “keenness of mind”, mental speed, numerical abilities, verbal abilities, brain teasers and “3D thinking”.

Answers are provided but not the explanations of why. Didn’t find it useful. Also, on the ebook there are no page numbers, so when part of the book said “go to page 80”, it stumped me.

Was it part of the IQ test?