The best prep suggestion I can give is practice taking NCLEX questions. Do an internet search, or visit your local Barnes & Noble to purchase study guides by Kaplan, Barrons, etc. The above image was from a net search.
For a brand new nurse, at least in Texas, ADNs & BSNs have equal chance of getting hired for bedside nursing at acute care facilities. Although, you could do as I did. Four years after becoming an ADN I enrolled in an RN-BSN program. This program was very different from my ADN program. We were treated as professionals D/T already an RN. Our clinicals were much different than in my ADN program, too. Anyway, something for you to think about because with a BSN you will other opportunities besides bedside nursing.
GOOD LUCK!