Should I Prep for CAT?

I have very bad acads 7/6/6, GNEM, this year I gave CAT and got around 89 percentile without prep.

The thing is even if I get in a college with my past acads will I be able to secure a job? Will this past acads haunt me even after a MBA.

I am going to prep for next CAT exam but is it worth it for me?