OK a level 2 qualification is the same level as GCSE. However, a GCSE usually involves a lot more work and exams than some of the other level 2 qualifications, e.g. Ky Skills, DIDA (Diploma in Digital Applications) or GNVQ (those aren't being taught anymore)
The Government wants all school leavers to have Level 2 qualifications in English Maths and IT. In practise, what usually happens is students pass their GCSEs in these subjects and everything is fine. However, if a student fails one of these, and wants to go onto a level 3 qualification (A levels, Btech etc), the college or school will insist on the student resitting the missed qualification. It's fairly obvious that most A level programs will not take on students without GCSE English or Maths, but what tends to get forgotten is the IT requirement.
So whatever he wants to do in the future he's going to have to bite the bullet and do it sometime. The options, usually when you go to college are IT Key Skills. This consists of a portfolio made up of assignments and an exam (currently multi-guess). While the whole thing is not too difficult, I would advise him to get the IT out of the way BEFORE college for 2 reasons.
- Level 3 qualifications take up a lot more time and effort than GCSEs. It's usually a complete shock to the system, just the amount of extra work that is expected and needed. Having to do an extra IT qualification as well cuts into the social and study time.
- Key Skills classes in college are generally full of students who wasted their school time and really don't want to be there. They make their feelings known. Constantly. I work in the computing dept of a college, and Key Skills is the poisoned chalice. We all avoid doing them at all costs because the stress of 20 disruptive, angry, unmotivated students is beyond belief. I pity any committed students in those clases because the rest make it extremly difficult to get any work done. I cannot stress how horrible those classes can be and how even me, who has a bit of a reputation for being able and willing to teach the most challenging group, will not go near Key Skills for love nor money.
Finally get your son to look at job adverts. Notice who almost every one of them will ask for some proof of computer literacy. And if you live in SE London, I can always come around and do my scary teacher bit.