https://www2.ed.gov/policy/gen/guid/religionandschools/prayer_guidance.html

Most people think prayer has been banned from school but it has not. It is still legal to pray in schools but have certain specific guidelines. The above link lays out how and when students and teachers can legally pray in a acedemic setting.

I recommend you check out sections II. Applying the Governing Constitutional Principles in Particular Contexts Related to Prayer. Section III. Applying the Governing Constitutional Principles in Particular Contexts Related to Prayer and Section IV The Equal Access Act.

It says students have the right to pray at certian times when instruction is not being given, read their Bibles, and hold prayer groups and etc. Teachers may also pray but not during times of instruction. That is just a small bit. Read the info you will be surprised.