How many chapters will be adapted in the first thirteen episodes?

From the leak info the anime will countain 13 episodes, but how many chapter will be adapted.

In The Offcial Trailer. Knight of Moralis make an appearance. so its probbely around chapter 17 (end of volume 3), But i personaly think its such a waste, because after that its Second Pentagram Test Arc. The best arc to show how disturbing the world fom this manga. If they want to set a cliffhanger for the next season. my guess is they'll adapt around chapter 35 (end of volume 6) The middle or the entire of Great Hall Arc.

What do you think? and which character you most excited to make it to the anime? Mine is Tartah.