private string getTest3(string subid)
        {
            int         countTest1 = 0;
            List <Mark> listMark   = SubjectDAO.getListMarks(subid);

            foreach (var i in listMark)
            {
                if (i.Test3 >= 5)
                {
                    countTest1++;
                }
            }
            float percent = 0;

            try {
                percent = countTest1 * 100 / count;
            }
            catch (Exception ex) {
            }
            return(percent + "%");
        }