Absolutely. You can prepare for CAT on your own. FMS Delhi usually has the highest cut offs for its 200 seat intake. The selection process includes 3 stage method. They are:

Eligibility Criteria
Group Discussion and Personal Interview
Final Selection

The basic eligibility criteria remains 50% aggregate for General Category in Graduation and 45% for Reserved Categories or equivalent CGPA from any recognised University. The percentiles in CAT are considered for the further rounds. In 2018, the weightage given for various sections of CAT have been as follows:

QA: 30%

DILR: 30%

VARC: 40%

An additional 3 marks are added to the Composite score in case of women for shortlisting. This score is used only for shortlisting Candidates for Personal Interview. The weightage for Final selection is as follows:

Personal Interview: 15%

CAT score: 60%

Group Discussion: 10%

Extempore: 5%

10th marks: 5%

12th marks: 5%

An additional 3 marks of the maximum aggregate will be added to the women candidates who have attended the Interview. Now with all this process, the cut offs is an important issue to be discussed. Previously FMS used to consider overall CAT score for shortlisting. However since the past 2 years, FMS has been giving sectional preference and weightage. VARC occupies the top position with 40% weightage.

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.

Preparation tips:

Read articles from time to time. Follow newspapers, magazines, and watch the news channels and browse the internet to keep yourself updated. You will need a lot of reading to help you in the comprehension section. You will need speed to help you in this section and you can achieve that only by thorough practise and reading. Take time to understand the question because most answers are interlinked.

Verbal Ability Books For CAT:

1.How to Prepare for Verbal Ability and Reading Comprehension for the CAT( by Arun Sharma and Meenakshi Upadhyay)
This book is good to brush up your verbal and reading comprehension skills. It covers three important topics: reading comprehension, verbal ability and verbal reasoning. It provides sufficient practice and mock papers for self-assessment.

2.Verbal Ability and Reading Comprehension For The CAT( by Nishit Sinha)
This book by Pearson provides not only an exhaustive resource for verbal ability. It also includes numerous tests as well as integral problem solving techniques and approaches.

3.Word Power Made Easy (by Norman Lewis)
This is the go-to book to improve your vocabulary. It is not a book to be read but a book to work with daily to enrich your vocabulary.

4.High School Grammar and Composition( by Wren and Martin)
It is a very good book for people who want to improve their grammar skills. It helps to understand and conceptualise different aspects of grammar and it is a must have book for anyone with poor grasp on verbal ability or who wants to make up with the basics of english.

Read books from different genres
The ultimate key to improve your verbal ability is to read extensively and to read books from different genres. This ensures that when the time for reading comprehension comes you are well acquainted with different writing styles and topics. Reading extensively also improves your reading speeding over a period of time. There are no shortcuts here.