Should I prepare for CAT? (Read body text)

10th -93.8

12th - 89.2

Graduation: 8

So I am bvsc graduate (veterinary doctor)

I wanna prepare for CAT

I have a few job offers around 45k per month

I wanna prepare for CAT and get into IIM but is my background not a problem?

Also OBC category

And I have no idea where to start my CAT prep from