Here is a sample prayer that you could use as inspiration for praying for your teacher:
Dear God,
I lift up my teacher to you today. Thank you for entrusting them with the important task of educating and guiding your children. I pray that you would give them wisdom and discernment as they lead and instruct their students. Help them to have patience and grace when dealing with difficult situations or students. May they find joy and fulfillment in their work, and may they be protected from burnout and exhaustion. I pray that they would be a positive influence on their students, and that they would inspire their students to learn and grow.
In your precious name I pray, Amen.