I have found that teaching two classes at the same time is an insane idea.
What can you hope to accomplish? You can only teach one lesson at a time.
You can only help so many kids at once, and some need one on one.
They end up waiting for you to answer their questions and some wait for the
entire period and accomplish nothing if they get stuck. It's seldom managable
and often aggravating for all involved.
Patti