Any respectable wizard academy will have a crystal ball that lights up with an intensity corresponding to the affinity mana channeled into it!  The students who manage to make it light up the most will act incredibly arrogant about this, and nobles who thought they were supposed to be the best student will get angry at any commoner who manages to best them.  They should all be taken out and impaled with crossbow bolts.*

(*)  Said in a footnote.

For one thing, there's all sorts of spellforms that only take if you channel enough mana into them, which acts as one kind of implied thresholded test.  That aside, any respectable wizard academy will have a crystal ball that lights up with an intensity corresponding to the affinity mana channeled into it!  The students who manage to make it light up the most will act incredibly arrogant about this, and nobles who thought they were supposed to be the best student will get angry at any commoner who manages to best them.  They should all be taken out and impaled with crossbow bolts.*

(*)  Said in a footnote.

For one thing, there's all sorts of spellforms that only take if you channel enough mana into them, which acts as one kind of implied thresholded test.  That aside, any respectable wizard academy will have a crystal ball that lights up with an intensity corresponding to the affinity mana channeled into it!  The students who manage to make it light up the most will act incredibly arrogant about this, and nobles who thought they were supposed to be the best student will get angry at any commoner who manages to best them.  All of these idiots should be taken outside and impaled with crossbow bolts.*

(*)  Said in a footnote.

There's all sorts of spellforms that only take if you channel enough mana into them, which could double as thresholded tests?  That aside, any respectable wizard academy will have a crystal ball that lights up with an intensity corresponding to the affinity mana channeled into it!  The students who manage to make it light up the most will act incredibly arrogant about this, and nobles who thought they were supposed to be the best student will get angry at any commoner who manages to best them.  All of these idiots should be taken outside and impaled with crossbow bolts.*

(*)  Said in a footnote.

There's all sorts of spellforms that only take if you channel enough mana into them, which could double as thresholded tests?  That aside, any respectable wizard academy will have a crystal ball that lights up with an intensity corresponding to the affinity mana channeled into it!  The students who manage to make it light up the most will act incredibly arrogant about this, and nobles who thought they were supposed to be the best student will get angry at any commoner who manages to best them.  All of these idiots should be taken out and impaled with crossbow bolts.*

(*)  Said in a footnote.