How many 150 Question sample practice papers set must be through before appearing for final exam.

What trick we have to apply if in case we have individual dx code given in Question and i
ncase multiple dx code are assigned in option to select the right dx code.
And How much time i should calculate for each question in exam.
I will be thank full to you for your response & valuable advice on that.
Thanks & Regards,
Nikhil Jain