Come on, horses aren't THAT high up.
Unless you're a tiny shortstack of a girl, I guess, then they're pretty tall comparatively speaking.
That being said, I really do wonder how they're going to spin "Anne sucks at these lessons" into "Anne somehow becoming a top student and/or helping the others in her class". It would be quite a blow to her reputation as the Wisdom of Tearmoon if she couldn't do basic math, after all. I hope she ends up actually putting in some hard work though- she DOES have good qualtiies beneath the 'chicken doing everything to avoid the guillotine' facade that she's created for herself. She already has Ludwig to help her, after all.