A number of reasons;
Not interested in the subject/school
Learning disability
Emotional distress
Lack of understanding
Lack of drive (ie a student who needs help but won't seek it out)
Lack of understanding/shame (a student who knows they need to help but is too embarassed by that need to see it)
Their base needs aren't being met -- see Maslow's hierarchy.
Math is one of the hardest subjects you can ever do. Go in and get some math help or get a tutor to help you understand
In my case im failing since my elementary/primary school was sooo easy and High School math is harder since they "get with the program" in High School.
EAgamer999.
Some Highschoolers are just lazy or have lazy teachers or just don't have math brains.
TechKidx.
Because they either don't give a crap about school and don't care if they fail or they find the work hard and no matter how hard they try they can't do well. Or there always is that they can't be bothered to do anything.
ANSWER 2:
Few people fail a course in high school. It is usually up to the teacher whether to fail a student or not. For instance, if a kid got 47 %, but the teacher feels the kid did his best, the teacher may choose to round the mark up to 50 % and allow them to pass the course. However, if the teacher felt the kid didn't try, then they would probably fail the student.
they devote most of their time in studying math
They get low scores because they don't answer enough questions correctly.
Glenville State College's 2014 25th-75th percentile SAT Math Scores are 370-460, meaning 25% of students scored 370 or lower on the Math portion of the SAT, and 75% of students scored 460 or lower (i.e. 25% of students scored 460 or higher).
Coastal Carolina University's 2014 25th-75th percentile SAT Math Scores are 460-560, meaning 25% of students scored 460 or lower on the Math portion of the SAT, and 75% of students scored 560 or lower (i.e. 25% of students scored 560 or higher).
Catholic University of America's 2014 25th-75th percentile SAT Math Scores are 500-610, meaning 25% of students scored 500 or lower on the Math portion of the SAT, and 75% of students scored 610 or lower (i.e. 25% of students scored 610 or higher).
Castleton State College's 2014 25th-75th percentile ACT Math Scores are 17-24, meaning 25% of students scored 17 or lower on the ACT Math Score, and 75% of students scored 24 or lower (i.e. 25% of students scored 24 or higher).
Central Connecticut State's 2014 25th-75th percentile SAT Math Scores are 460-560, meaning 25% of students scored 460 or lower on the Math portion of the SAT, and 75% of students scored 560 or lower (i.e. 25% of students scored 560 or higher).
Mary Washington's 2014 25th-75th percentile SAT Math Scores are 510-600, meaning 25% of students scored 510 or lower on the Math portion of the SAT, and 75% of students scored 600 or lower (i.e. 25% of students scored 600 or higher).
UCLA's 2014 25th-75th percentile SAT Math Scores are 610-740, meaning 25% of students scored 610 or lower on the Math portion of the SAT, and 75% of students scored 740 or lower (i.e. 25% of students scored 740 or higher).
Scripps's 2014 25th-75th percentile SAT Math Scores are 620-700, meaning 25% of students scored 620 or lower on the Math portion of the SAT, and 75% of students scored 700 or lower (i.e. 25% of students scored 700 or higher).
LSU's 2014 25th-75th percentile SAT Math Scores are 530-630, meaning 25% of students scored 530 or lower on the Math portion of the SAT, and 75% of students scored 630 or lower (i.e. 25% of students scored 630 or higher).
Longwood's 2014 25th-75th percentile SAT Math Scores are 470-550, meaning 25% of students scored 470 or lower on the Math portion of the SAT, and 75% of students scored 550 or lower (i.e. 25% of students scored 550 or higher).