Conversation so far:
where did Bhaktisiddhanta Sarasvati go to school?
Bhaktisiddhanta Sarasvati Goswami started his formal education at an English school at Ranaghat
did Bhaktisiddhanta Sarasvati go to any other school?
In 1881 Bhaktisiddhanta Sarasvati Goswami was transferred to the Oriental Seminary of Calcutta
what did Bhaktisiddhanta Sarasvati study?
Bhaktisiddhanta Sarasvati studied English, Sanscrit, Hindu texts and poetry, mathematics, and jyotisha (traditional Indian astronomy).

Question: when did he graduate?
Self-contained rewrite: when did Bhaktisiddhanta Sarasvati graduate?