With us players do all their own attack, critical and skill look ups. They do their own spell info look up unless the GM feels s/he needs to verify it.
Our character folders have the following (use dry erase page sleeves);
Page 1 & 2: Basic info. Name, race, sex, background, stats, profession, realm, talents/flaws, known associates, and on...
Page 3 & 4: Exp page (on left) combat tracking page (on right). PM me an email address and I can send you a version of our combat tracking sheet if you like.
Page 5 & 6: Pretty much all skills (automated excel sheet).
Page 7 & 8: Regular equipment and currency (on left) and all magical items/equipment (on right).
Page 9 & 10 and on (facing): Weapon table on left, Primary Crit table on right.
After those: Every spell list you know (possibly condensed down ourselves if you only plan on a few ranks in some lists - i.e. Pure Arms users who pick up a few spells).
At the end some have a page or two for random notes.
We often also have the next level already worked up in case we level mid adventure (we generally don't require official training and even if we were to impose that requirement we would assume skills that need to be trained can be if someone else in the group has that skill at a higher level).
