There are certain courses that makes a candidate eligible for IBPS Agriculture Field Officer Post. The courses are as follows-

Agriculture, Horticulture, Animal Husbandry, Veterinary Science, Dairy Science, Fishery Science, Pisciculture, Agri Marketing & Cooperation, Co-operation & Banking, Agro-Forestry, Agricultural Biotechnology, Food Science, Agriculture Business Management, Food Technology, Dairy Technology, Agricultural Engineering, Sericulture.

As BSc Community science is not in the list, you are ineligible for the exam.