I'm totally on board with this approach. After all, it make sense that Wizards would know the relative power levels of spells (it takes a greater degree of skill to cast fireball than it does to cast light, for example). And just like levels of, say, mathematics in our schools, they would know the general skill level of someone who could cast a given spell, based on the relative power levels. And just like in our schools, the wizards can be classified into groups based on their knowledge and proficiency.Actually I think I came up with something. I looked at the wizards spell progression and every level they get a new level spell slot, I assigned a title. So here we go...
1-2 Novice
3-4 Apprentice
5-6 Journeyman
7-8 Adept
9-10 Magus
11-12 High Magus
13-14 Master
15-16 Grandmaster
17-20 Archmage
Actually I think I came up with something. I looked at the wizards spell progression and every level they get a new level spell slot, I assigned a title. So here we go...
1-2 Novice
3-4 Apprentice
5-6 Journeyman
7-8 Adept
9-10 Magus
11-12 High Magus
13-14 Master
15-16 Grandmaster
17-20 Archmage

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.