by Dominique-Alain Jan.
Hello,
Do you mean that you have as many assignments as the number of students?
In that case, you have to provide for each assignment a key and give that key to the corresponding student.
Alternatively, if you do this often, you could crate a group for each student and then create a grouping for each group (you can do this with a cvs file when importing your students in the course). Then you can provide an assignment to only the members (here only one student) of a grouping.
Regards,
-dajan