A lot of students prepare for CAT at home and get selected. Why can’t you?
It cuts your travel time and that would mean that you have the advantage of having an hour or more with you to be utilized in the preparation. But on the other hand, if you are weak in the fundamentals, it can be devastating. Although if you believe in yourself it can be a good option. Discuss with friends who are already attending a coaching for CAT.
It solely depends on your decision.
Best of luck!