You can check which students have been marked as attending a SEN Unit or Resourced Provision by going to the grey custom report. Go to Reporting > Custom Report, New Report, then on the right side select the Support Tab. Here you will find SEN Unit and/or Resourced provision. Tick those you are interested in, then run the report.
The report will display a table of all students, so filter the SEN Unit (or Resourced provision) with a Y (or Yes), press return and the student names will appear.
If this in inaccurate, go to their student profile, click on the cog next to the SEN Provision and you can edit it here:
Then Save at the bottom of the SEN area for this entry.