Del. Code Ann. tit. 5, § 2408
(b) A written test shall not be treated as a qualified written test for purposes of subsection (a) of this section unless the test adequately measures the applicant’s knowledge and comprehension in appropriate subject areas, including:
(d) (1) An individual shall not be considered to have passed a qualified written test unless the individual achieves a test score of not less than 75 percent correct answers to questions.