I know this is a two year old topic, but I came up with a solution to this that I think will work. I'm using the Free For Teachers version.
1. Create an extra section of your course, I titled mine the first letter of the special ed teacher's last name whose case load the students were on.
2. Add the students to that section through the People tab in your course, students can be in more than 1 section, so keep them in the section they're in, and have them also in this extra section.
3. Add the special ed teacher to the course as a TA, when you do put them in the extra section only.
4. THIS PART IS KEY: Go into people, find the special ed teacher, click on the 3 dots to the right, go to "user details" and toggle them to only be able to see students in their section.
Now when they login and go to grades, they will ONLY be able to see those students you've put into that section.
This way, if you have students in multiple section who are on one special ed teacher's caseload, when they login, they will only have to deal with seeing their own students and not filter through all of your other students.
Hope this helps!
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