The textbooks will be provided by Ava, she asked Sofia not to bring her materials. I assume that Ava's tutorials will not contain visual information, only text.
But these are just my assumptions.
But speculation is based on previous stories from various plots. Everyone loves Sofia's breasts, everyone wants to see her. Why are Ava's boys worse?
It's just that, unlike other stories, there is an educational process in this, and as we already know, Sofia can go far for educational purposes. At least I hope so.