To better prepare for the exam know the exam pattern of what type of questions will be asked, then go through the entire syllabus and analyze which sections seem to be easy and which are tough so that you can allocate your time accordingly, in both the papers I and II. You can buy any one of the ugc books and also refer to post-graduation action books covering the important concepts in detail. YouTube videos can be viewed to gather more information on a particular topic. You can try to solve previous years paper to practice better and you can also practice through online mock tests.
Hope this helps, Good Luck.