I think enough time has passed for us to roughly gauge the average intellect for most mems so this is how i reckon they fare against each other.
A Gigi, Kronii
A(-) Fauna=Shiori
B(+) Ina, Mori
B Baelz, Ame, Bijou, Nerissa, Gura
B(-) Mumei, Mococo
C Fuwawa, Kiara, Irys

D Mel(benchmark)

Inconclusive data: Elizabeth, Raora, Cecilia
Note: A tier means being able to get into a academically demanding profession through merit. Going down the tier, it would be more challenging for them