Those are ideal A levels, so that’s a great place to start. If he wants to do vet med, he needs hands on work experience & plenty of it. Farms, kennels, rehoming charities, riding stables as well as veterinary surgeries are all good places. Some experience of large animals is important. Vet students need to know how to handle pigs, horses & cattle calmly & safely, for obvious reasons.
The profession has become increasingly corporate in recent years, and is only going to become more so. His first job is very likely to be with a corporate, particularly in the small animal sector, so he will need to deal with financial targets, budgets, KPIs, processes etc etc.
Lots of young people want to be vets, and have an idealised view of the profession. Cute puppies, cuddly kittens, challenging surgery, fascinating exotics etc etc. Well, there is some of that, but there is also a heck of a lot of blood, shit & death, too. Young vets need to be robust enough to deal with this.
Source : A close family member is a very experienced small animal vet.