We have an audio program but you SHOULDN'T use it while driving. We have NLP and hypnosis, visualization, and binaural beats, so operating heavy machinery or driving is not encouraged, as it could be dangerous. You can check out a sample here.
https://testprepny.com/full-potential-audio-program/
I suggest, though, if you don't find what you're looking for, to create your OWN audio. This is super easy to do on your smart phone.
What is it you hope to learn or get out of the audios? You won't be able to do mental acrobatics while driving, so you might want to create somethng you need to memorize. Grammar rules or Quant equations. Record yourself going over various quant rules/equations,
You'll notice when you're driving that you likely move in and out of being present and engaged with what you're listening to, so over the course of driving, that mental movement in and out of your conscious mind, you're actually embedding the information in your subconscious mind. Think of the times you've heard a song on the radio...you might not listen to the words, but seem to know some words, and likely the melody or a guitar riff. Same experience.
Other suggestions include exploring other aspects of the test taking process, ie. peak performance, or the application - - or information about schools, and b-school in general, I wonder if this would be a good opportunity for you to listen to things like this.
My last suggestion is to take the driving time for YOU time without using it for any kind of study. Listen to books-on-tape as an escape FROM studying. A little oasis in time. Taking breaks is actually GOOD for you. It will give your mind time to integrate things you're learning. Full-time study/work without breaks will work against you. Socializing, self-care, exercise, and non-study time will support you to have a balanced self while studying.
let us know how it goes!