Hi op I would echo those who say maths A level with a 6 (a great grade for sure) is not a good idea. Someone in ds2’s maths a level class got a 6 and really struggled.
Those choices sound fine if the student is interested in them; what I would say is that they close a lot of doors and don’t particularly open any others.
What I mean by that is that there are some subjects which are essential for some degrees - maths for a maths degree, French for a French degree, Eng lit for an English degree (tho I am sure someone will tell me otherwise, but at least in general).
Obv any A level choice will close done doors. My dd took Eng lit, French, geography. So she couldn’t do engineering or biology (etc) but she could still do those subjects.
Economics politics and ICT are not specifically needed for any degree (most econ degrees want maths). Lots of degrees of course require no specific subjects - class civ, sociology, criminology, law, politics.
Are there any more traditional (“door opening”) subjects he could take? History, biology, geography? Just might give a few more options post 18.