so you are saying go for mba by entrance exams only

If you don't want to leave yur job, try distance education courses. Regular education will always have the better edge in the job market.

You can go for the CAT or MAT entrance exam. CAT is held each year in the month of November. MAT is held four times in a year. Most of the top B schools accept only CAT scores, though a few of them consider MAT scores also. I suggest you target some reputed colleges, and get to know the cut off perc