Search demand for "how to improve your IQ" and "how to improve your intelligence" usually wants one of three different things, and sellers often blur them.
Three claims people mix up
Test score movement. Practice effects, item familiarity, sleep, and anxiety can move an IQ score without proving a durable jump in general intelligence (g).
Competence growth. Crystallized skill and domain expertise keep rising for years with hard study. That is real improvement even when Raven-like fluid scores barely budge.
Far transfer from brain games to broad Gf. Near transfer to trained tasks is common. Large lasting Gf gains are not the default finding once active controls enter the picture.
