Schorlarship from Beckett- SPOILER
Problem with getting a scholarship boost from Beckett upon returning from Giovanni Mansion:
Unless you're shooting for Research 10 or something, to read the Firearms 5 or Computers 5 manuals, the parts of the game that high persuasion is useful (Charisma + Scholarship) come during the Mansion itself or before it (Glaze shootout and such). Past this point, the game becomes more action-oriented rather than social. I usually boost my persuasion to 8. Getting it to 9 isn't really worth it. (You can "get the dirt" from the Giovanni members for an additional 2 XP, because you can do so from 1 of them with persuasion 8) And having a high charisma rate isn't that helpful, but scholarship helps with both persuasion and research. By the time you recover the sarcophagus, I almost always already have scholarship 5.
I don't think boosting persuasion or scholarship past 8 is that useful. The Melee 5 book you can only get if you have security 5. And during the game you can boost your melee with the Kendo book and than with Nines (up to 5). Inteligence 4 costs 12 XP, so the math just doesn't add up. Too bad... I wish you could get the scholarship boost from Beckett earlier in the game.