DS1 ended up with 9 GCSEs grades B & C taken over two years. He got two Bs in year 10 and failed (missed getting Cs) in two subject in year 11. For him he did well, at one point it looked like he might get very little but he pulled it off in the end.
He's since, through an extra curricular activity, achieved two further level 2 qualifications. Not particularly relevant to any of the jobs or courses he's applying for but interesting conversation starters and useful skills in any job. Think community/teamwork.
I'm wondering if they should go on his applications/CV. Do equivalents suggest that the school didn't consider him "academic" - it won't be clear that the qualifications weren't done at school alongside the GCSEs.
OTOH they are extras that most won't have.