Chapter 37: The Water Serpent?
After the Professor destroy the two perverts.
"Ok it's time to train class, Now it's time for Mana Stamina Training"
Training for Mana is that you need to drain all your Magic to surpasses the limit of your Magic Stamina.
"Okay here we goo!!"
Zoel didn't know how to cast a magic, because he never experience how, even if he is already rank A his clueless*idiot.
Suddenly there's an Earthquake.
*Cave Forest Growl's
*ROAAAA
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Ranking 
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stone