I would hazard a guess that it is to do with the new 'linear' GCSE's, that I wish I had been told about before my DD and I chose the 'traditional' options route for her.
Under the 'modular' system, her school (after consultation with me) were happy to let her do the GCSE's rather than life skills, and in her options, she was predicted 'C' in Health and Social Care, 'B' in Textiles, and 'B/A' in Catering.
Her core subjects, she was predicted 'D' in English, 'C' in science, and 'E/F' in Maths.
Now, under the new 'linear' course, she will probably get 'U's for all of it.
It's going to totally fuck her entire life up.
If I thought I hated Gove before, now I positively detest him, and an wishing evil things in him. My first wish for Gove is a plague of body lice, then maybe a plague if termites in his underpants!
So, OP, my DD is also in Y9, and recently chose her options. She has SN, but they still let her choose traditional
Options, despite the fact that she will be unlikely to get 'C's in her Core subjects.
I think had the school been fully aware of the changes to linear exams from modular courses, though, their answer may have been a bit different.
This school is top of the league tables for our town, and has been for some time. I see that changing for DD's cohort as they have let lots of DC's with SN's do traditional GCSE's, assuming a modular course, which will now result in more DC not getting good enough grades, and thus slipping them down the league table.
If my DD's school had done this on the explanation of 'not good enough headed expected', I'd be going batshit tbh.