Just get the highest awareness girls to the highest level ero charge level possible in each area. You will eventually get there.
For 2 (beast girls) it's awareness 2 and ero charge 3.
For 3 (elves) you need a beast girl with awareness 4 And ero charge level 4.
For 4 (demons) elves need awareness 6. Ero 5.
5 (angels) demons 8 and 5.
Existence eraser. Angels 10 and 5.
You can buy a map in the shop to guarantee the specific girls schools. (It's not necessary)
All this really does is let you reroll the uniform color pallets without rerolling the girls.