Ashish, IIM has never set any predefimed syllabus for CAT. But based on previous years papers, syllabus has been assumed and has been practised. CAT exam paper can be Categorised into 3 parts:

Quantitative Ability
Verbal Ability and Reading Comprehension
Data Interpretation and Logical Reasoning

Quantitative Aptitude covers almost 30% of the CAT question paper. QA can be categorised into Arithmetic, Algebra, Geometry and Advanced Mathematics. Practise chapter by chapter and develop mental calculations. Like practise more of basic summation, subtraction, fractions and tables. Numbers, Percentage, Profit and Loss, Simple and Compound Interest, Ratio, Proportionality, Time-Distance, Time-Work, Mixtures, Averages, Partnership, Permutation and Combinations, Probability, Set Theory, Progression and Series, Line, Angles, Triangles, Quadrilaterals, Polygon, Circles, Ares, Volume, Height and Distance, Coordinate Geometry, Basic Trigonometry are few important topics.

In Verbal Ability session, command on your English, Grammar, Vocabulary, Understanding of the given paragraph are of more importance. Reading English NewsPaper will also help you in your preparation

Data Interpretation and Logical Reasoning needs to be practised as much as possible. Comparison of data, Data Analysis, taking clues, interpreting missing data, coming to conclusions and making future projections will be covered under this Category. The questions here are interlinked and so if you get one formula correct, cracking the next few questions will be easy. So it's important to memorise and practise formulae. You should cover topics like Data tables, Data Charts, Bar Diagrams, Pie Charts, Graphs, Data Comparison and Analysis.

Hello student I'll help you with the complete cat syllabus. The cat exam consists of 100 Questions spread across three sections:-
1)Verbal ability and reading comprehension (VARC)
Topics:-
Synonyms Antonyms (Vocabulary Based)
Grammar or English Usage
Correction in Sentence
Fill in the blanks
Jumbled Paragraph and Close Passage
Analogies and Reverse Analogies
Meaning/Usage Match
Verbal Reasoning
Summary Questions
Reading Comprehension
Facts Inferences Judgments
I've marked boldly the topics which are coming more from last 2-3 years

2)Data interpretation and logical reasoning (DILR)
Important topics :-
Caselets and Tables
Bar Graphs and Column Graphs
Venn Diagrams
Line Charts & Pie Chart
Combination of two or more types linked to each other
Number and Letter Series
Calendars, Cubes and Clocks
Binary Logic
Seating Arrangement
Matching
Logical Sequence
Connectives
Blood Relations


3)Quantitative Aptitude (QA)
Number Systems
LCM & HCF
Profit, Loss & Discount
Percentages
Speed, Time & Distance
Time & Work
Simple & Compound Interest
Ratio & Proportion
Averages
Quadratic & Linear Equations
Complex Numbers
Logarithm
Binomial Theorem
Sequences & Series
Surds & Indices
Inequalities
Probability, Permutation and Combination
Set Theory
Functions & Geometry
Mixtures & Allegations
Trigonometry
Coordinate Geometry & Mensuration
The cat is exam of 180minutes total 60 minutes each subject.
Students can't switch between sections like while answering VARC Student need to complete all questions of VARC First then he can move to DILR but he can jump on questions of same section.

You can also avail cat free mock test by careers360 which is very helpful to review your concept that'll help you to score more marks
https://learn.careers360.com/test-series-cl-cat-2019/?icn=CAT_test_series&ici=CAT_article_contmap

Feel free to comment if you have any doubt
Good luck

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