Hello Aspirant ,

I think self preparation is best for CAT examination during graduation because you can understand how to manage things . So, self preparation is better  .

Some tips is there to follow get good results in CAT exam let's go through them.

1. You have to go through the syllabus .
2. Start preparation with 2 or 3 hours a day after sometime increase your hours .
3. Go through the Previous papers and get updated with it (it will increase your speed and improve understanding how questions are asking).
4. Prepare a time table to manage with graduation subjects and cat exam subjects.
5. Maintain mentally fit it's very important .
6. Be confident and maintain good health .

Go through this article for more information and updates CAT 2020 .

https://bschool.careers360.com/exams/cat

Go through this article for how to prepare ,Best books , tips, e.t.c.

https://bschool.careers360.com/articles/how-prepare-for-cat

I think this answer will help you !!!!

All the best !!!