It is based on how you present your view about the various decisions and options that are asked to you. They also wish to get to know more about yo ur mental state and how you handle things.
I applied online. I interviewed at First Student (Waukesha, WI) in Jan 2021
Interview
Asked a few basic questions, filled out a personality quiz? and was offered a job almost immediately. And then they start you on the process for getting your CDL and getting drug tested sometime during your training.
Interview questions [1]
Question 1
They ask how you're going to handle bus issues and children
Very easy. They asked simple questions. If they like you they will give you the job on the spot. Just past all the required tests such as drug, physical, DOT, company...