Office interview is nothing more than formality, your performance during mud school is your actual interview since your employment status is not guarantee until you pass mud school. As such, you will not be treated as an equal coworker until you actually pass the class, especially by the majority of instructors on North Belt campus who will let you know that you are expendable, your days of employment are numbered the minute you step into the building, and they will not shed any tear when you got escorted out of the facility.