The Attorney General shall not institute a civil action under section 1706 of this title before he—
(a)
gives to the appropriate educational agency notice of the condition or conditions which, in his judgment, constitute a violation of part 2 of this subchapter; and
(b)
certifies to the appropriate district court of the United States that he is satisfied that such educational agency has not, within a reasonable time after such notice, undertaken appropriate remedial action.