See past question papers, RTP's, MTP's, and study only those rules covered in these papers.
But it is advised that you should not leave any. Don't get nervous. Take it easy.
I suggest that first you get an overview of the whole, e.g. how many rules and what they cover individually. And then start learning all one by one. Same as we study all AS one by one.
Thanks, I wish it'll help.
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