He was raised in the Catholic faith by his faithful Catholic parents, Maria Agustine and Doss Mary.  He was given the sacraments of baptism at St. Joseph's Church, Kottaikadu. It was his home parish untill 1988 and he received the sacraments of Eucharist and Confirmation in his home parish of St. Antony's Church, K. Rasia Mangalam.

He has one older sister, Maria Anandhi, and older brother, Nixon Immanuael, and a younger brother, Fr. David Milton HGN.
Fr. Arockia finished his school studies at Catholic Boarding schools and after High school joined the seminary where he had rest of his formation and degree studies.

He studied his Philosophy and Thelogy at Dharmaram Vidya Kshetram, Bangalore a pontifical Institute for Philosphy and Thelogy  from 2004 - 2009. He was ordained to priesthood by Most Rev Dr Neethinathan (Bishop of Chinglepet) on December 21, 2009 at St. Thomas Mount (Historical St. Thomas Mount Shrine) in Chennai. He has ministered as a Parochial admininstrator at Arogya Annai Parish, Nandhambakkam in the Diocese of Chinglepet, Tamilnadu.  For two years he served as a missionary priest in Lusaka, Zambia and for four years he served as parochial Vicar and deputy principal at St. patrick's Chruch and High School Sonapur and St. Thomas' Church and High School, Kathiiatoli in the Diocese of Guwahaty, Assam a north eastern state in India. He was back to his home state and served as a co-pastor at St. Michael's Church, sammanasoor in his home Diocese Tanjore for a year. 

He travelled to United States on October 3rd 2019 to serve as the missionary priest in the Diocese of Biloxi and started his ministry as Parochial Vicar at Our Lady of Victories Pascagoula on December 1, 2019. 

Fr, Arockia's  priestly motto is " never be tired of doing what is right" (Gal 6: 9) His favorite hobby is cycling, games and traveling and reading.