You have not mentioned about your basic qualification. But doing MBA to enhance your academic growth is always a good idea. If you are an Engineering Graduate, perusing MBA would be more helpful. Perhaps you may be aware that admissions for MBA/PGDBM in reputed institutes like IIM, Indian School of Business, NIRD and MANAGE and other Universities is done through the CAT examination and the score card is the criterion for your selection. Getting a score of 90% to get assured in good colleges/Universities is not an easy task. For getting a berth in IIM, your score card should be 99%plus. Having working experience, you would be given preference during selection process. There should not be any confusion in deciding your career for yourself.
In case, you are an ordinary graduate in Science or Humanities or Commerce, don't take any risk unless you get a good score in CAT/XAT/GMAT which would ensure a seat in the reputed institutes because placement after completing MBA also depends on your backdrop of Graduation and Institute where you have studied. If you are interested to do MBA but couldn't get a good score in CAT , then don't leave the job and try to do it through distant mode or through evening courses, which would be an ideal situation.