Would diagnosis help unemployed 25 yr old stepson

My partner's son is 24 years old. He performed well academically at school and went to uni for four years. He did not attain BSc and we recently discovered that when he was not attending (some) lectures, he shut himself away in his room to eat an play a game on the internet, had very little social contact, received zero support from the uni and was not confident enough to ask for help. (I did not know him well at this time.)

Two years later he remains unemployed. He has had some warehouse work and a short temporary job which had fantastic potential but the organisation ended his appointment abruptly due to a minor incident and as a agency worker there was little that could be done due to the terms of his contract.

I am not sure if this is helpful but prior to my involvement he did not appear to have any idea about how or where to look for work, what to include in a CV, how to respond to email messages, respond to interview questions. 

This past year he has focused on gaining an apprenticeship and I have been helping him with interview prep but he is not getting past the first interview. At primary school, Asperger's was suggested but "as he had friends and was doing well" no further action was taken. I understand there is possibility of support available once he is IN a job but would diagnosis and formal confirmation help for the APPLICATION and INTERVIEW stages? 

If the answer is Yes, would he first ask his GP? What precise tests are essential that he undertakes.

Any feedback and suggestions from this community would be appreciated as I am rather heart broken by the negative experiences this young man is enduring.

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