You can apply for banking recruitments. The most desired job by any candidate approaching banking sector is PO exam (i.e, Probationary Officer Exam). SBI releases notification of their PO exams every year. Please go through the details from SBI careers portal. You can also try for the same post in other banks too. There will be recruitment notices in their career page.
You can try visiting all the PSU websites and look for current openings and application process. Your an MBA candidate and can apply for junior level assistant or clerical post in Sales, Purchase or Administration Department to kick start with.
You can look in newspapers for any updates on openings. Major PSU in India are BEL, BHEL, BSNL,ONGC, ITI,etc
You can also opt for some competitive exams like IAS,IRS,IPS,etc if your willing to spend time in preparing yourself for such exams. There are many coaching centers like TIMES who train students for banking and other competitive exams. You have not mentioned the name of your city to advise you the any coaching centers but TIMES center should be available in your location or you can try to google nearest institutions list. Parallelly you can try for any private sector companies which provides better scope to nourish your career.