I just abused the hell out of Adderall to get Stimulation 25. You can also drink Atomic Coffee, but it’s not as easy and gives Radiation.
Around 19 INT, I learned the styles very quickly. You need to be using the style on the CBM, to my knowledge. Also, when you’re using the CBM, you cannot improve any of the skills in Yellow. All of those skills are set to 5, regardless of your actual skill in them, and stay there, and all EXP is wasted. This is because the CBM is performing the actions for you, not yourself (see Shadowrun and Cyberpunk 2020 for similar examples).
Naturally, when I learned the styles I needed from it, I stopped using it entirely.