Aha, whoops! Accidentally put it in the comment sec tion!
What you are looking for can be written many different ways, actually.
You could say...
1. "I am scheduling a math lesson with my teacher."
2. "I am going to go over (or you can put "study " rather than "go over") timetables with my teacher."
3. "I am setting a time to study with my math teacher."
You can use different words or even change the sentence completely. In a conversation, you could say, "I'm scheduling a lesson with my math teacher."
If the person is interested, they may reply with, "What kind of lesson?" or "What are you going to learn?"
Then, you can answer what kind of lesson it will be.
Hope that helps!