Section 158(8) in The Delhi School Education Rules, 1973
(8)Where the number of students eligible for receiving exemption from payment of fee is in excess or the number of students to whom exemption is admissible under these rules, the exemption shall be made in order of merit on the basis of the results of the immediately previous annual examination or, if necessary, on the basis of a special competitive examination held to determine the order of merit of the eligible students.