Awesome Ganapathy. Thanks again for the prompt reply and good points. Really appreciate it. Unfortunately I cant aware you points 
Got answers for my queries. Now I will be studying for C_HANAIMP151 
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Last but not the least, how do I get the SAP learning hub subscription ..Please send me the link. ..and have you completed this C_HANAIMP151 ? Was it easy ?
Cheers
DR