What chapter did Percy get thrown out of yancy?

Percy Jackson was not thrown out of Yancy Academy. He left Yancy Academy at the end of the first book, *The Lightning Thief*.

This is because:

* He had just found out he was a demigod, the son of Poseidon.

* He was on the run from the monsters sent to kill him.

* He had to go on a quest to clear his name and stop the war between the gods.

Let me know if you have any other questions!