How far did Lal Bahadur Shastri study: Got degree from Kashi Vidyapeeth, what is the story of adding 'Shastri' in the name?

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Lal Bahadur Shastri: When and how was 'Shastri' added to the name of Lal Bahadur Shastri? Was that his family nickname? Know about his education, the degree he received from Kashi Vidyapeeth and the story that changed his name forever.