We have many teachers that use EEi and teach at multiple schools. You have a couple of options with this, and it really depends on your preference.
Option 1: One Account for All Schools (Single Username/Password)
For this option, you would enter all of your students from all schools into your account. Then you would create groups based on the schools and from that point forward, you would make assignments, share resources, etc. based on the schools. So all students from all schools would be in one class.
Option 2: Separate Accounts for Each School (Multiple Username/Passwords)
This simply means you would have separate accounts for each of your schools and your students would join your EEi Class based on the school they attend.
Some teachers like having everything under one log-in. Some prefer to keep schools separate.
If you need multiple accounts, you can request additional Teacher Activation Codes during the teacher account activation process.