how to score 99.9+ in cmat?? is there any guidelines

First go through the entire syllabus and then make a proper and programmatic study schedule. There are four sections in CMAT Quantitative techniques and data interpretation, General awareness, Logical reasoning and Language comprehension, So you have to prepare accordingly. Get the best books for preparing for CMAT. Choosing books sectionwise would be better. For Vocabulary, Grammar and Comprehension part, Word Power Made easy by Norman Lewis, English Grammar by Wren and Martin. For logical Reasoning and Data Interpretation, The Pearson Guide to Verbal Ability and Logical Reasoning for the CAT by Nishit K Sinha and For Quantitative Aptitude, RS Aggarwal's book will be good or How to Prepare for Quantitative Aptitude for CAT by Arun Sharma. Social Issues and Institution by Wizard Publication for general awareness and read newspapers also. In quantitative aptitude, focus more on Permutation, Combination, Bar Graph, Tables, Geometry etc. In logical reasoning many questions come from Linear arrangements, blood relations, Coding-decoding etc. Once done with the syllabus, you can move on to solving previous year test papers and give mock tests as much as possible.