It’s a difficult situation to be in and is unfortunately very common, it’s difficult to get a well paying job now there’s a lot of competition for most jobs anyway, and I can imagine when he is providing a cv with no recognised qualifications and also very little work experience it will be very easy to sift him our. For most entry level jobs you are at least going to need a Maths and English GCSE/qualification, so if he doesn’t have those he needs to find a way to either prove his qualifications from his home country are the equivalent and use those on CV, or failing that look at local colleges as most do some maths/english courses and get those under his belt as a minimum.
Without those, lots of doors won’t even open for him as you say it will just be an easy rejection as he isn’t meeting the minimum requirement.
Once he gets those qualifications one way or another he can then apply for most entry level jobs with the view of working his way up, or a potentially great option depending on his interests and skills could be an apprenticeship. It’s a low starting salary but then he’s on a low wage now anyway, they pay for you to undergo additional qualifications while working and the salary increases from there.
An agency isn’t going to invest in staff it’s not the nature of agency work, and working in manufacturing he is going to need qualifications if he wants to try anything else like welding as it will affect the companies insurance. It’s not as easy as just having a go, you have to be qualified.
Realistically if you want him to be able to increase his earning potential he needs to get some of these qualifications and if those don’t come free then there’s 2 options, either :
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Increase your earning potential to cover his training/qualifications even if it is temporarily so that he is able to get this behind him
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He needs to speak with his relatives and explain he can no longer afford to send money back at the moment, use that money to pay for any qualifications, and once he is earning more money if he wants to he can resume sending money if he wishes