The education or lack of it, of Ambridge residents is a weak spot, I agree. Running through those currently under 50(ish):
Roy went to Felpersham to do Business Studies. Brenda got her marketing degree there, but that was a comedown after she abandoned her degree in Radio Production or whatever it was at Bournemouth when Betty died. Hayley is a qualified nursery nurse.
Ruth and David both have agricultural diplomas from specialist colleges. Pip is studying for a degree in agriculture. Josh and Ben will presumably also be encouraged to go on to higher education.
Elizabeth has a marketing qualification but it's not even close to degree level. (Nigel had nothing beyond A level, if he even got that far, but that is not so unusual for one of his age.)
Helen has the equivalent of a degree or an HND in Cheese Studies or similar from a place called Reeseheath (it's a real agricultural college). We don't know what Rob's qualifications are. Jess as a social worker must have studied to postgrad level, which may suggest that Rob did too.
So far as we know, Kirsty has no degree. Tom definitely doesn't. He dropped out of college when he was about 17/18, I think.
We know nothing about the education/training of James or Leonie or Coriander as far as I can recall. Very remiss!
Adam has a degree in agricultural economics from Newcastle. Ian must have had some sort of vocational training.
Debbie never finished her degree. She dropped out during the second year after having an affair with a lecturer (Simon Gerrard, whom she later married and divorced).
Kate of course has her postgrad certificate in International Development from Felpersham, which she was able to enrol for even though she doesn't have a first degree. 
Alice - chartered engineer. First degree and an MSc. By far the best qualified younger person in Ambridge. Christopher - qualified as a farrier.
Ed - nothing except the Thinking Skills course the court sent him on after his car crash and Sheepshearing 101 last year. Will - basic training to be a gamekeeper. Emma - NVQ in catering and basic hygiene certificate.
Fallon - something like an HND in music technology.
Jazzer - Sheepshearing 101, with Ed.