GnomeWorks
Adventurer
Wizards can't become learners; or, at least, straight wizards cannot.
To be a learner, you have to be able to spontaneously cast at least 2nd level spells.
As for a sorcerer knowing a blue spell of a level higher than he can cast... he just can't cast it. Knowledge of blue spells exists outside of the standard system: a learner can know a number of blue spells equal to his learner level + intelligence (score, not mod), regardless of level.
To be a learner, you have to be able to spontaneously cast at least 2nd level spells.
As for a sorcerer knowing a blue spell of a level higher than he can cast... he just can't cast it. Knowledge of blue spells exists outside of the standard system: a learner can know a number of blue spells equal to his learner level + intelligence (score, not mod), regardless of level.