Every character we see whether Starfleet or civilian seems to have the ability to perform amazing feats of intelligence and knowledge. They seem have a near perfect recall and understanding of everything they're exposed to. They can reprogram or reconfigure computers, know how to repair and operate any alien or foreign spaceships they encounter, etc.
As a recognized unit of measure, the average IQ for a 21st century human is approximately 100.
Examples of special circumstances of exceptional IQ in the Star Trek universe include; Q's claims to an IQ of 2,005 and Barclay's IQ rose to somewhere between 1,200 and 1,450 (TNG:4x19, 'The Nth degree').
Beyond the examples above, has there been any in-universe comments or correlations as to an expected or claimed intelligence level contrast between a 23rd-24th century individual or group and a 21st century individual or group? One quantifiable reference we have is that 8-9 year old children in the Star Trek universe are taught calculus whereas today it's not taught until age 13-14 for the 'smart kids'.
They seem generally much smarter as a group; has there been any quantifiable comparison by how much?