I applied through college or university. The process took 3 weeks. I interviewed at CarMax (Atlanta, GA) in Feb 2017
Interview
Phone interview first to an onsite interview. Onsite interview was case heavy. The behavioral interviews asked pretty straight forward quetion that are typical. There were no difficult questions.
Applied online and got an email scheduling an online test two days later. It is about half an hour test, 18 questions in total, all about math. Not very hard if you took some basic statistical and math courses.
I applied online. The process took 1 week. I interviewed at CarMax in Mar 2017
Interview
HR initially emails with link to online assessment to take, which is quite similar to the IR portion of the GMAT (reading and interpreting information from charts/graphs). If you succeed on that, next step is phone interview with a manager in the department.
The manager also has a business case quiz over the phone to begin the interview (which is a simple scenario based on inventory and processes at a fictional store), followed by a few behavioral type questions.
The manager I spoke with was not in HR, and so wasn't a very strong interviewer. The questions were run-of-the-mill.
Interview questions [1]
Question 1
[During business case questions] What could the store do if the mix of available cars on the lot was thrown off?