Not sure that this is any help. I did a part-time fine art degree while signed off on what was "sickness benefit" I was also old style income support and D.L.A. That was quite a while back. I graduated in 2010. I did the part time degree over 6 years (had great fun). I received all the student finance grants etc from the university and from the local authority. Because I did it over 6 years it did not affect my DWP benefits at all. That was a long time ago though and I am sorry but have no idea what the rules are now.
The following user(s) said Thank You: Gary, bubbles