CAT

Yes, you can start preparing for CAT either you can start self-study and go through CAT syllabus once. If you think some topics are tough than coaching is best option. Else prepare yourself and join a good test series to evaluate your performance. Major topics in CAT are –
Quant-
Number System
Arithematic
Algebra
Geometry
Permutation & Combination/Probability:
Miscellaneous Topics: Set Theory, Trigonometry, and Logarithms
DI/LR-
Data Sufficiency
Bar Graph
Tables
Case-lets
Pi-charts
Verbal and Reading Comprehension-
Fact Inference Judgment
Fill in the blanks
Grammar
Para Completion
Para Jumble
Sentence Correction
Verbal Reasoning
Word Usage

Number system: Basic topic of this.Arithmetic: Arithmetic has a vast number of sub-topics.Algebra: Considering this has been one of the most dominant topics in CAT in the last three years, it makes a lot of sense to place extra emphasis on this topic.
Geometry: Another topic which has featured quite a lot in the last few years.
Permutation and Combination/Probability: This is another topic that contributes around one to two questions to the exam.
Miscellaneous Topics: This includes Set Theory, Trigonometry and Logarithms.

Career Launcher
IMS
These are the best.
Apart from these go for online apps and appear for mock tests. Doing all these I got 93.5% in CAT and was selected by Doon Business School, Dehradun.

You can go for self preparation. Along with that, you must join a good test series. Regular tests will help you evaluate your performance and work on the weaker topics. Just keep working hard and be determined. Keep notes of important formulas and short cuts.

PT Education, TIME, CH Edge Makers, Career Launcher, Cerebral Heights, IMS and there are many other institutes in Bhawarkua and Palasia areas. TIME is the most enrolled one by students. PT Education is also a good one, it started from Indore only. Career Launcher also a good one.

Some of good coaching institutes in Bangalore are -
CET Tutorials, Career Launcher, Career Plan, IMS Learning centre
In Chennai-
Brilliant Tutorials, Magnus Institute, Ascent Education, Career Launcher. In Trivandrum-
TIME, IMS, Greens Educational Consultants Pvt. Ltd., Career Launcher.

Hi Madhu, It depends upon the cut-off FDDI sets for this year. If the cut-off is high, you getting in is difficult and if the cut-off is low and less number of people are above you who have applied your chances of getting it is high.

Yes, all B-Schools including Iims give weightage to CAT scores for first shortlist. After first shortlist, students go through What/PI and than final shortlisting is done. A good score in CAT do helps one to get into top-tier B-Schools of India. What-PI performance is also considered after CAT scores.

For Quant
Arun Sharma How to prepare for Quantitative Ability for CAT published by Tata McGraw Hill
Arun Sharma The Complete CAT Digest, by Tata McGraw-Hill
For Verbal
How to Prepare for the Verbal Ability and Reading Comprehension for the CAT by Arun Sharma and Meenakshi Upadhyay
Nishit Sinha The Pearson Guide to Verbal Ability and Logical Reasoning
For Data Reasoning
How to Prepare for Data Interpretation & Logical Reasoning for CAT (Tata McGraw-Hill) by Arun Sharma.

With 90 percentile in CAT you can target institutes like K. J. Somaiya, IIT-KGP/Roorkee/BHU, IMI-Delhi, TAPMI, FORE-Delhi, LBS-Delhi. IMT-Ghaziabad, XIM-Bhubaneswar. Mostly What-PI is conducted by institutes for shortlisted ones based on CAT scores. Institutes consider different aspects (diversity, work experience, personality) in PI.