Texas Education Code - EDUC § 28.0216. District Grading Policy

(1) must require a classroom teacher to assign a grade that reflects the student's relative mastery of an assignment;

(2) may not require a classroom teacher to assign a minimum grade for an assignment without regard to the student's quality of work;  and

(3) may allow a student a reasonable opportunity to make up or redo a class assignment or examination for which the student received a failing grade.