Hi Dear, 

according to me , the top colleges for post graduation in economics are :

• Delhi school of economics
• Indian statistical institute - delhi/ kolkata
• Indira gandhi institute of development and research - mumbai 
• Gokhale institute of politics and economics- pune
• Jawaharlal nehru university - delhi
• Madras school of economics - Madras
• Jamia millia islamia - delhi
• Narsee monjee institute of management studies - mumbai
• shri ram college of commerce - delhi

i hope the information is helpful for you 

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good luck