Dear Ali,
I undergone SAP HANA training and I started preparing since July 2013, I suggest you to go through the courses of HA100 and HA300. There are SAP certified books available, but never rely on single book. you should have to have adequate amount of preparation time and hands on experience on concepts and topics. Looking at various informative materials and videos, these will provide you Just a basic level of understanding. practice, practice and practice is the key for success. I don't want to suggest any particular author book related to this exam. use your own experience and your own strategy for passing the exam.