I would be very surprised, considering the culture Calormen has which includes pre-arranged marriages and slavery, if girls were expected to attend school. I think it much, much more logical to assume any sort of studies Aravis had were tended to by a tutor at home, which would include story-telling and possibly reading and writing.

I don't think the slave would have gotten more than a beating as a punishment, since it really wasn't her fault she got drugged. After the 10 stripes she would probably just assume her normal duties again, perhaps with a little less favor, but undoubtedly without torture or grusome pain. After all, a female slave would have to be of considerable "rank" and possess certain knowledge to attend a Tarkheena, and such slaves were not often treated just like dirt but were actually quite valued. I think it's safe to assume she got punished and then just continued her life in the mansion without much incident.

One thing I really admire about Aravis is her quick wit and how she is able to manuvre herself out of difficult situations very efficiently and think her way through quite thoroughly in a very short amount of time. I also really admire her courage, and the fact that she goes through a change with the help of Aslan from a high, mighty, haughty Tarkheena to a much meeker and humbler girl (although still with an attitude) who accepts and apologizes to Shasta/Cor even before she knows that he is a prince.

I like how she gets a chance to play an important part in the effort to save Archenland, in that she is the one who finds out about Rabadash's plans. Shasta is the one who brings the warning to the King, but he gets it from her.

The scene where Aravis and Lasaraleen overhears the plans, is entertaining, but for the girls it was a terrifying experience to have to keep quiet and fear to be found. Lasaraleen is quite shaken afterwards and doesn't want to do anything but go home and rest, but Aravis refuses to do any such thing and insists that they go on with their plan to have her escape.

Granted, Aravis is in a more desperate situation than her old friend, but I think this also shows her courage - she doesn't waste any time on being comforted by the other, but sticks to her own plans even though she has been through a shaking experience.

And her courage enables Shasta to save Archenland.