I'm not aware that there is any method to dramatically increase SAT scores (and neither IQ test scores). could you point me to your sources?

Straight from the College Board themselves:

https://research.collegeboard.org/media/pdf/osp-technical-re...

That report also references another study showing that each hour of tutoring was associated with an increase of 2.34 points on the SAT score which unfortunately is behind a paywall:

https://www.researchgate.net/publication/282492223_Preparing...