I respectfully disagree. I think Manhattan method would be the most optimal for what he’s looking. Given that Manhattan method is the most general for hard skills and 3 of the skills he wants to improve could benefit greatly from it: Physics, Math, Coding. And one of the skills can still benefit although to a lesser degree: Language. I think it’s the most appropriate, especially since it also has memory improvements. It is much more general than cyber brain and I think it would fit him more.
I don’t have conceptual conglomerate, but from what I can read, I don’t think it’s the field he should get either, at least first. I think it greatly develops understanding of life and self realizations etc, probably psychic understanding too. But we cannot ascertain how much it would help for math, physics, language or coding. And it was not made for any of that anyways. Meanwhile Manhattan is definitely made for Physics, Math and Coding would be a rival to cyber brain but since it is very logical and math based Manhattan would still help a lot in theory. Language cyber brain is unlikely to help as much as Manhattan Method I believe.
Hope it helps.
Of course @Dyst0p14n if you can get more than one field, go for it. Search the brain index from @DR_MANHATTAN