Hey lkjh12345,
If you are looking for a significant amount of prep material you could consider getting a Manhattan 5lb book. It has extensive set of question which are classified into chapters and types. I think this would suit your needs perfectly. You can use this book in tandem with your Cliffnotes GRE book.
For GRE to GMAT equivalence you may use the exel file tool attached below.
Best wishes for your preparation.
Regards,
Attachment:
GRE-GMAT_Comparison_Tool(1).xls [152.5 KiB]
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