One field for each one category - SOLVED -

I use flexicontent 1.5.4 and flexiaccess.
I created the template notes, copying the default template.
I created flexiaccess groups of teachers and students, but help me to control visibility.
I have created using "flexicontent" the category "Notes" and, as subcategories of the category "notes", the names of individual students.
I have created the type "notes"
The subcategories "students" and type "notes" linked to the template "notes"
Users teachers have a form (frontend) to send the notes.
On that form there is a field "select" with notes for each student.
Each field "select" can only be seen by one student and their teachers.
I created a menu with items like "flexiconten category" for each student to see your notes.
I also created the same type of menu for each teacher to see the notes of his students.
When a student goes to see his notes is a table with empty columns.
These empty columns correspond to the notes of other students.
I am trying to remove these columns, but I can not.

Thank you very much, ggppdk!!
Your last suggestions were perfect.
It works.
I am using the permissions for each note field and have created one template for the notes of each student and one other template for all the notes for teachers.
regards

Great, i am glad it worked, but adding a student involves some work on your part, maybe you need to write down instructions for the administrator.

Regards

You're telling me to order a task for the server administrator? What task? What they can do to help me? My site is in a shared server.
Regards

I meant who will be adding students, you or you give site to someone else to do such tasks ...
Only this

Regards

Y work alone.
Regards