Can you give me some useful tips for preparation for Common Admission Test ?

Here I am giving you some useful tips for preparation for Common Admission Test below :

Firstly you must know exam pattern with syllabus of Common Admission Test. Then you have to give more attention for important topics of Common Admission Test.

You have to make notes for important topics of Verbal Ability, Quantitative Ability & Data Interpretation & Logical Reasoning and revised them regularly. For better preparation you have to solve the previous year question paper of CAT Exam or you can buy books for it..

Books for CAT :
Analytical & Logical Reasoning For CAT
Author: B S Sijwali, Ajay Singh

How To Prepare For Verbal Ability And Reading Comprehension For The CAT
Author: Arun Sharma, Meenakshi Upadhyay

How To Prepare For Quantiative Aptitude For The CAT
Author: Arun Sharma

CAT Syllabus

There is no fixed syllabus for IIM CAT. Past exam pattern depict the questions are mainly from these areas usually divided into three sections

Section I
Quantitative Ability comprising mainly of arithmetic, mensuration, geometry, algebra, trignometry, probablity and calculus etc

Arithmetic - number systems, ratio propotions, simplification, averages, ages, time, work, distances etc.
Geomtery - triangles and circles
Mensuration - areas and volumes
Algebra - theory of equations, quadratiic equations, pemutations and combinations, sequence and series etc
Trignometry - height and distances
Calculus - maxima and minima, functions etc

Section II
Data Interpretation and Data Sufficiency

Data Interpretation - line graphs, bar charts, tables, pie diagrams, scatter diagrams and passages on logical ability
Data Sufficiency - more stress on quantitative questions mainly numeric, percentages etc

Section III
Verbal Ability comprising English Grammar, Vocabulary, Proficiency, Usage and Comprehension

English Grammar - not many core questions
English Vocabulary - no straight synonyms or antonyms but sometimes analogies or pairs in fill in blanks
English Proficiency - correction, rearrangement and completion of sentences and paragraphs
English Usage - inappropriate usage of words, commonly confused pair of words
English Comprehension - around five to six paragraphs with around 1000 words and five to six questions each mainly checking your ability to comprehend with speed.