Hey,

That's a pretty tough call to take and that should be solely taken by you only. Your academics are very good plus you have work experience. If you are pretty confident that with 2.5 months of vigorous study you can crack CAT with good percentile then leaving the job shouldn't be a much problem as you are going to achieve something huge and it won't be regret for you.

The last call is to be taken by you. So think wisely and analyse your confidence and weak areas and then come to a decision.

All the very best.

Thank you.