Today we had group of kids who broke several beer bottles on the pathway around the playground. A mother who was there with her children on the second playground closer to the office, came and reported what was hapenning. She said she confronted them and they replyed to her aggresively. The mother didn't want to leave her name. When I went with her to check the area they had left already, but they left behind a bag with their information. The site was very dangerous. My maneger recommed we called the high school they attend to report the incident, it happens that the student is not longer with them. The principal's secretary recommended in this kind of situations there is not much they can do, they would prefer us to just contact police directly.

Thanks for cheking

chasco
Yes, you have grammar in this passage. I have repaired some of it:

Today a group of youths broke several beer bottles on the pathway around the playground. A mother with her children on a second playground closer to the office came and reported what was happening. She said she confronted them and they replied aggressively. The mother didn't want to leave her name. When I went with her to check the area, the youths had already left, but they left behind a bag containing identification. The site was very dangerous. My manager recommended that we call the high school they attend to report the incident, but it happens that the youth is no longer a student there. The principal's secretary said that in this kind of situation there is not much they can do; they would prefer that we contact the police directly.
Thank so much.
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In MM's fixed version, the sentence "My manager recommended that we call the high school they attend to report the incident, but it happens that the youth is no longer a student there," the part "the youth is no longer a student there" should be "the youths are no longer students there" to keep in line with the fact that there are multiple youth. Also, I would have used a comma after 'today' at the beginning of the paragraph, but I am not sure about that rule.
The bag containing information presumably belongs to only one youth.
It is implied that there is identification of more than one youth, thus it should be said that more than one youth does not attend the school anymore.
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I believe we should let Chasco decide that, Watchaya.