About the "Review Fee"
Once you have received an IET certification, you may opt to re-take (i.e. "review") the same class for a much lower fee. The fee includes attending and fully participating in the class alongside new students. It does not include an additional handbook nor a new certificate - you must bring your own copy of the handbook, or purchase a new one (e.g. if your original handbook was lost or destroyed).
You might want to review the class if you have been away from practicing for a while, or just want a little extra instruction.