I passed the CCNA 200-120 exam last Friday in my second attempt

my study materials was CCNA R&S study guide with Todd Lammle book, CBT nuggets Jeremy Cioara, Boson and lots of practice in Cisco packet tracer and some practices with physical labs.
The Boson exams give you the feeling how the real test is going to be, it will give you the idea of time you can spend for each question. It will also give you good details of every questions.
However even when I was getting 850 - 900 in the Boson practice test dozen of times, I though I was ready when I sat the exam for the first time.