I would say the following: "As requested, I am sending this message to remind you to go through your notes prior to our class tomorrow." Note: "your notes" and "our class" are accurate and simpler ways to say what you want to say. If you were to go with the answer above, I would change it to "I am conveying a message from (person) to please go through the notes before the class tomorrow." (No need for 'on tomorrow')

"(As requested, )I am here to convey a message (from WHO) : Please go through the notes before the class on tomorrow." * ( ) = optional