Deepa,
Only you can decide when you are ready. I would ask the following questions:
1. Have you been through ALL the simulator questions? (Not just tests and quizzes - but all of the questions)
2. Of the ones that you got wrong, do you understand why you got them wrong?
If not, I strongly recommend going through all of the simulator questions. By doing so, you will gain a better understanding of how questions are worded for the real exam.
Best,
Harry