With 14 int as a human you get 5 skill points/level. With that you can max out concentration , max out 3 main knowledge skills, and split the rest between lesser knowledge skills. Of course this depends on the campaign but the 3 main knowledge skills you max out are arcana (magical beasts, dragons, constructs), nature (animals, giants, fey, monsterous humaniods, plants), and either planes (outsiders, elementals) or local (humanoids). Knowledge (religion) and (dungeonerring) are too limited to really max out unless in specific campaigns.
I suppose you could bump int to 16 but I'd rather have the 16 in con unless you're willing to dump dex to 10 so you could have 16's in str, con, and int.