What is the best source to prepare for BSNL JAO?

How can I start preparing for BSNL JAO fir 2019 with zero knowledge? Suggest some best resources to start with? Is it possible to crack this exam with 6 month preparation?


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BSNL Junior Accounts Officers
मॉक परीक्षण अभ्यास के लिए
BSNL Junior Accounts Officers