Increase IQ by 20 points 6G

[Ampersnd]

I wasn't using dual n-back when you asked, but since, I've started back up again.
This evening, I got up to n=5 and managed to stay there.

I found this video on improving brain power; a lot of it seems interesting: https://www.youtube.com/watch?v=Sc7NNr8KnYs