Zodiac Academy: spoil me please?

Zodiac Academy is a reverse harem serie that feature two heroines: twin sisters to be exact.

I've only read up to the entrance ceremony scene. I had to put the book down since I got super dizzy at all the "chosen one" and "Mary sue" premises raining right after another in that one scenes haha.

I need urgent spoilers.

I'm a very firm of what I like and dislike. And one thing that is a ginormous no for me is reading sisters going at each other throats. It's tiring to read for me...

Thus I wanted to ask, if the twins eventually face each other as rivals or fight over a crown (or top spot) or a guy etc.