Sec. 7766-4. In order to ascertain whether applicants for age and schooling certificates have satisfactorily completed the school work prescribed in section 7766, General Code, the board of education of any city school district may appoint a juvenile examiner who shall receive such compensation as may be fixed by the board of education. When such a juvenile examiner is employed no such certificate shall be granted by the superintendent of schools of the district unless the juvenile examiner has certified that he has examined the child and that the child has passed to his satisfaction the grade test as provided by section 7766, General Code, provided, however, that if a child in the opinion of said juvenile examiner is below the normal in mental development so that he cannot with further schooling and due industry pass such test, such fact shall be certified to by said examiner and the superintendent of schools shall grant the child an age and school certificate printed on yellow paper with the words "Retarded-Schooling not Standard" written, printed or stamped diagonally across the face; and provided, further, that if the juvenile examiner is satisfied that the standard of any school is sufficiently high, he may accept the records thereof as showing that a child has passed the required test. In case no juvenile examiner is employed the superintendent of schools may proceed and determine in like manner; if after proper tests he determines that a child is below normal in mental development to the extent specified above, he shall grant such a "retarded" age and schooling certificate. If a child who desires an age and schooling certificate is granted a "retarded" certificate but secures only a limited health certificate; the word "limited" shall be written or stamped across the face of the "retarded" certificate and the limited "retarded" certificate shall be on yellow paper; in which case the certificate shall show to what employment it is limited.