Section 50(2)(a) in The Goa, Daman and Diu Secondary and Higher Secondary Education Rules, 1975
(a)If the seat number of any candidate is not traceable in the Centre list, a provisional seat number, prefixing the name of the centre shall be allotted (e.g. Mapusa - 1) by the Conductor to the candidate with instructions to write the same provisional seat number on all the answer books and supplements.