Registration Query

Mr Ghosh is a Proprietor of 3 different business (Trade Name also different) and for that they have Trade Licence in different location in Same State i.e West Bengal. I have the following queries

1) Is he required to take 3 GST Registration against Proprietor PAN in west bengal ?


2) For that How to calculate turnover for registration? Is it individual business wise or Total Turnover against Proprietor PAN.