I join IIM Bodh Gaya or try the CAT next year again? My 10th, 1Should 2th, and grad scores are 10 CGPA, 89% and 75%, with respectively no work experience.

Dropping a year is a very risky decision and has its own consequences. So it’s better you analyze your prospects and inclinations before forgoing an offer from any IIM be it Bodh Gaya or Sambalpur. It requires a lot of courage to risk an entire year just to target a better B School. Sometimes it’s worth it and sometimes it’s not. So I will suggest you to forgo such an offer only if

• You have a perfect plan to prepare excellently for CAT next year and you are confident you will score a higher percentile 
• You are good at the DILR section. Even if you prepare for your CAT again, you cannot improve much in the DILR section. You can improve your quantum and verbal skills but not much in the DILR section. So if that is one of your weaknesses, I don’t think leaving the offer is worth the risk.
• You are going to work somewhere and gain experience. This is very crucial as during the interview you cannot say you took a drop year merely because you wanted to prepare for CAT.

I will say that IIM Bodh Gaya is not bad of a choice mainly because it is an IIM under the mentorship of IIM Calcutta.