Well it was worry over nothing. John told them that he had the holiday planned and that he could either start work when he returned or start and then leave for the holiday. They said they really needed him asap, so he starts as soon as his background check is finished, they said the coming monday. There wasn't even any discussion about whether he could go on the holiday.
Apparently no one is passing the first written test, so they never even get to the interviewing process. Thats why they had him in the next day after passing the test, and did the hands on test/interview and offered him the job right off. If someone doesnt pass the test they can't move forward, they have no leeway. John passed the test, but not by much. He likely missed all the electrical stuff. Its a bear of a test.
He will be a temporary for 120 days and then they will assess his improvement on electrical. He was told to study three phase motor control theory.
We'll leave for the holiday and then restart work when he returns. So YAY! Employed at a great company and we are going on holiday and can enjoy ourselves knowing we dont have to look for a job anymore! Thank you everyone for chiming in.