Which familiars can't Akatsuki Kojou control by season 3 of the anime?
Right now he cannot control 3 Familiars, it's the 6th, 8th and 10th one.

Those are the ones he got so far:

Season 1 EP 4
- Control over 5th Familiar

Season 1 EP 8
- Control over 9th Familiar

Season 1 EP 12
- Control over 3rd Familiar

Season 1 EP 16
- Control over 12th Familiar

Season 1 EP 19
- Control over 4th Familiar

Season 1 EP 22
- Control over 11th Familiar

Season 2 EP 3
- Control over 7th Familiar

Season 2 EP 5
- Control over 1st Familiar

Season 2 EP 8
- Control over 2nd Familiar