1. Heard learned counsel for the petitioners, learned counsel for the State and learned counsel for the Bihar Public Service Commission.

2. The two petitioners have filed this writ application for a direction to the respondent Bihar Public Service Commission (hereinafter referred to as The Commission) to declare them successful in Primary Teachers Competitive Examination, 1996, under the reserved category.

3. Case of the petitioners is that an advertisement was published some time in May, 1996 for holding a preliminary examination for appointment of primary teachers in various schools of the State. The two petitioners belonged to other backward class (OBC) and most backward class (MBC) respectively and they were otherwise qualified to appear in the examination. Therefore, they submitted their applications and were issued admit cards. They appeared in the examination and were successful. Thereafter, some time in the year 1999, another advertisement was published for holding mains examination. In the advertisement it was stipulated that candidates of other backward class, most backward class and others should submit their caste certificate and creamy layer certificate issued