Boy if this is the reality of flight instruction today, I'd suggest another sport/vocation! :( You should definitely come prepared to fly and study what to expect on your lesson based on the curriculum (part 141 school) or on what your instructor (should have ;)) told you you'd be doing today (part 61 school). Having said that, your instructor absolutely should provide a pre and post flight brief on what to expect (pre brief) and how you did and how it could have been better (post brief).
I know from my own experiences as both a student and instructor, that short changing the student of these important "gab sessions" , the student is not getting the most out of their (expensive) flight training.
Don't complain if your instructor is charging you for briefing time. If the instructor is discouraged from charging for his time, he won't do it. The instructor will move on to the next student (and billable flight hour) leaving you, the student, without the proper context to understand how you did on your lession or what to prepare and study for for the next.

Ground school starts tomorrow! I can't wait! :D

Thanks all for the great advice!

Good Luck! All the best! Mine starts in 3 months!!! :D

I would also recommend Rod Machado's Private Pilot Handbook. I wish I got that book earlier when I was getting my private. The book itself is very interesting to read compared to the FAA material that could be very dry and boring at times. Also, get all the FAA books and print out the supplement advisory circulars that are listed in the Private Pilot PTS below the Practical Test Book Description.