@Jonathan Breton best of luck! It's been a while since I was in school, but from what I remember here are my top two pieces of advice:
1. Pay attention in class and don't zone out during the lecture. A lot of this stuff is a completely new concept, so my brain was hurting after a few classes (I took my classes on the weekends, 9-5 so it was a long day). You definitely need to know it for the test so listen to what the instructor is emphasizing and if you get those concepts down, you should be good to go. Some of it is just straight memorization.
2. Don't miss any of the hours in class. You're only allowed a certain amount of time anyway, but if you miss a key point, it's hard to catch up. There's a lot of material in that short amount of time.
I went to Superior because they had the best passing rates for schools in the area.
I don't know that being an unlicensed assistant would help all that much. As an agent, that would limit greatly what you could do for me. It would most likely be running signs and lockboxes, picking up checks, etc so I don't think it would be as much of a learning experience as you'd think.
If you're truly wanting sales to be your focus, I'd start with being on a team. Like someone else said, interview a bunch of firms and see where you may be a good fit. But starting out, you don't make money for a while unless you have a pool of buyers and sellers waiting for you to get your license. Joining a team will accelerate your learning and the support is good to have. You give up more of your commission, but as long as you see the value in that, it's worth it in my opinion. You can always reevaluate when you've got your feet under you and feel confident on your own.
As far as firms that might be best, Keller Williams has the best training that I've seen that teaches you how to actually run your business and scale it to be successful, not just 'how do I sell real estate'.
#justmytwocents