I took the online course and listened to all 100 podcasts. I listened while driving to work and from work back home.
After passing the online course I took 7 simulation tests, scoring between 58 and 68. After each test I reviewed all my incorrect answers and found patterns of mistakes.
Sometimes I reviewed the entire exam.
All in all I decided to take the exam even though I was below the average recommended score to take the exam.
I passed around 70 (Target).
I recommend studying until you feel you reached a plateau, and then take the exam. I believe you'll pass. If you don't you might need to change your study method.
The simulator is a MUST to know where you are, and the value for money it provides is ten folds.
Good luck!