Yes, law school is all about dishing out extra money to get ahead (e.g. study aids, LEEWS, etc.). Upperclassmen will lie to you at orientation and tell you not to bother with these things, but the truth is that a majority of your classmates will be using them, and you will feel the need to keep up with them. You'll notice this when one day a classmate throws out a legal term that you haven't yet studied (such as the "shelter doctrine" in Property).
As you may have noticed, bragging about your class rank or your achievements is incredibly annoying to others. It's not a good idea to walk around and tell people that you're in the top 10% or to refer to yourself as a "Rising 2L." Law school is stressful enough without having to deal with such arrogance. Consider celebrating your achievements alone or with close friends. And if you're going to brag, make sure you present yourself as an intelligent person, and don't misspell other words (such as "saffron").
As for Law Preview, I don't know anyone that bothered with it. Those three professors do teach 1Ls, but I believe they teach different sections, so you will only get one of them during your first year.