Hello there,

As per my opinion you should try for CA as well as MBA at the same time. Start preparing for CA intermediate and appear in it after your Graduation because student who has completed there Graduation are eligible to give CA intermediate and you can Prepare for CAT at the same time because in CAT you are only asked with few section Quantitative Aptitude(Advanced version till class 10th Level), Reasoning and  English. And You are eligible for both CAT examination for MBA and CA Intermediate.

Just Remember to Never Give Up

Regards