Lots of good advice! DS applied for apprenticeships in a different area and be warned it can be a pretty gruelling process with CV, cover letters,telephone interviews, personality tests, technical ability tests, situation tests, group task interviews and face to face interviews. All sorts of different approaches by different companies.
My advice would be to not pin your hopes on one particular company, DS applied to 20 or more, started applying in October and got an offer in April. It takes a lot of work at a pretty critical time in Yr13, ds missed mocks and had to take time off school for some interviews.
He will need to spend time writing a CV, and writing cover letters that are aimed at that specific company and think about the questions he might be asked at interview and how he'd answer them (STAR method recommended). The more interviews ds did the more confident he got and more prepared for what might be asked. Examples of team work were always important.
DS had top grades at GCSE and A-levels but still didn't get interviewed for every position he applied to. He also had a CV full of relevant courses he'd done, clubs he'd joined, volunteering work he'd done, websites he'd made, competitions, things he'd designed/created, a relevant EPQ and an impressive NEA. They don't want to know about things you did 6 years ago though so it's not something you have to worry about for a while yet.
DS also applied for university, this is vital! It's really nice to have that in place to know you have a back up as an apprenticeship is far from guaranteed. The process is really interesting though and fantastic learning experience even if you end up going to uni - you realise just how competitive you need to be when you come out the other end and can't just rely on your 2:1 to get you a job.