Case
Motivation

I have a student who has failed every class so far this year, and is currently failing every class he is taking. I have tried to help this student in my classroom, and have even reached out to one of our administrators who works with students like him. She spoke to him for a long time and his mother, and supposedly he was going to start doing better. He was going to attend Saturday School and make up work before the end of the nine-weeks. That didn't happen. He continues to refuse to work in the classroom and won't take any help I offer him. He would rather create conflicts with other students and disruptions with his behavior. How can we try to motivate this student?

Solution #1
Could you develop a student interest inventory/survey to see what he is interested in? I have had several high school students like this (and still do), and I have found that once I have figured out their interests, I create assignments that suit their interests. From there, you need to set a goal. Is this student interested in joining the military? Perhaps the school counselor could set up a one-on-one session with a recruiter. Recruiters often have prospective recruits do fitness training on the weekend. The recruiter can help you set goals for the student in order to participate in the fitness training. The above scenario could also be replicated within a work program.
Solution #2
I would suggest talking to the student one on one about whats going on in their life and get to an idea of what they want to do in life. Sometimes students need to see that the teacher cares about something other than their math grade before they begin to comply with their directives.
Solution #3
Sometimes it takes digging deep into a child's personal interests/issues to determine what exactly it is that is bothering them, or deterring them from the path in which they need to go. I truly believe that students need to feel the support and feel that they are important which I am sure you have done in this situation. However, I would not stop trying. Once you have broken through the barrier that this child has built, it will be a great revolution. Perseverance is key in certain situations and once this child realizes that you truly care, and wish the best for him, then the breakthrough will occur. Keep targeting the child's interests and keep in contact with the parent/s to help with additional encouragement. It seems as though, he is striving for attention, so lets give him positive attention and try to redirect the negative behavior! Maybe work with a co-worker to develop a Behavior Intervention Plan... Also, encourage other students in your class to help with the process of support and encouragement for the child (if possible). I hope all goes well.

A very well thought out solution.

Solution #4
Find out what he is intersted in. And meet him there. Build a relationship with him to appeal to his interests a little more.
Solution #5
Talk to the student, or have someone, teacher, administrator, counselor, that the student in comfortable with talk with him and find out what would motivate him or what he would work for. Some options that might motivate him would be, your approval, a reward, extra credit, maybe even "free time" to read, draw, or work on something else he finds interesting. You could then use the thing that motivates him to encourage him to get his work done and behave well in class.
Solution #6
I would take some time from their free time and help work on his assignments.
Solution #7
I have a student like this. I found that working with this child one-on-one is a way to focus him. Find out what bothers this child, and what you can use for motivation. For me it was saying mommy would be so proud of you. I also remind him that mommy likes to hang up the work that he has completed at home.