Changing the title of the Assignment, Assigning each student an individual assignment

Hi,

I'm a special education teacher new to Khan Academy.  My resource students are working on assignments sometimes 2 or 3 grades below their placement.  Two questions. 1. Is there a way to assign math problems to them below their grade level without the assignment title denoting the grade level?  e.g. a fifth-grader working on 3rd-grade material  2. Ok, so I'm totally new to this. All of my students are assigned to my Google classroom but I want each student to have their own assignment.  They are not working on the same goals.  How do I assign each student their assignment?  Do I need to create individual google classrooms?   Thank you for any help you can provide!