Hi, OP -
Academic here. I agree with PP that firstly, DS is not alone and secondly, multiple factors are at work. I am sure not having A Level Biology is a big one. However it is also easier to talk about that with you than it is to talk about feeling overwhelmed by all the more amorphous changes DS is experiencing.
Crucially, it does sound like insufficient support has been provided for those lacking A Level Biology. I agree that this is wrong.
Does DS have a personal Tutor or Academic Adviser? If he says ‘No’ ask him to double check, because it’s a piece of data that slips by many during Induction overwhelm. I suggest he ask this person, or a Student Support Admin person, for tips on how to find a good Biology tutor and what material to cover. Probably an advanced Biology or Medical student, UG or PG. Then he could advertise on a student network for a small number of study buddies to share the cost (which will be less than the cost of a professional tutor).
I suggest that eg a group of four then advertise, offering, say, £50/hr for a 90 min session with the tutor to prepare (substantially) on their own time. They are dealing with a student so they need to be explicit about the duties ( they should provide all learning materials weeks ahead of time, for example, and weekly assignments and mocks should be prepared ahead. Of course it is fine to use online materials if they are good)
Would a Medical student be more likely to be well organised and able to relate? I don’t know.
Then the students need to honour their part of the agreement to a high standard, including work between meetings. They can easily catch up if they have a structured programme of work, but not in just 90 minutes per week!
As long as they are giving the tutor no cause for complaint, they can comfortably hold him or her to a good standard also. I don’t think it is racist to suggest that someone who took A Level Biology sounds the best bet from what you have described. With very good communication skills, of course - they should really look for this when interviewing.
Hopefully a side effect will be a pal or two, or at least a couple of friendly faces.
I am in STEM but I have seen this kind of thing work with personal tutees many times. Often students will start a tutoring group from within a year group of my tutees.
Very best wishes to DS.