Hi mangamma,
You ask a rather broad question - and the answer will depend on a number of different variables. First, what type of MBA Program is it (for example, Full-time vs. Part-time or Weekend-program)? Second, will your employer know that you're in the Program while you are still working - or are you planning to not tell your employer? By extension, if your Employer DID know, would the Company you work for support your educational efforts?
There are obviously lots of details to consider, including how well you could accommodate both a job and an MBA Program, the monetary cost of the Program, etc. but you're not the first person to face these potential issues. This is meant to say that you should gather as much information as you can and think in terms of whether you could actually make all of this work over the course of the next 1-2 years (depending on the types of Programs that you're interested in).
GMAT assassins aren't born, they're made,
Rich