To the extent that available funds are insufficient to provide services under the program established by this article to all pupils defined as eligible, the following priorities for the provision of such services shall be observed by the Department of Education:
(a) First priority for services shall go to pupils within the category of children described in Section 11202 of the Welfare and Institutions Code.
(b) Second priority shall go to pupils eligible for social services only under Chapter 2 (commencing with Section 11200) of Part 3 of Division 9 of the Welfare and Institutions Code, and among such category of pupils the order of priorities shall decline progressively according to the age of the pupils, with the youngest pupils receiving the highest priority.