Able Learner is human only, won't help anyway. Education only gives Knowledge skills.

And yes, a blue dragon can take a level of sorcerer and fulfill the requirements. But therein lies the catch, as any dragon can take a level of sorcerer and fulfill the requirements. Given equal CR, the dragon with the highest arcane spellcaster level is going to be the most suited to take down the wizard in any case, so you want a dragon capable of higher level spellcasting at CR 20 than the Very Old Blue Dragon Sorcerer 1.