"classified sales exec job"

Does this mean selling advertising space? If so, it's not secure at all, and the sort of job companies offer people without any risk to the company. If the person is good at it, great. If not, they lose the job. He could be out of work within weeks.

If this is all it is, in my opinion it would be mad to leave school with no A levels. Quite mad.

Many years ago I knew a girl who had a place at Sussex University to do Maths, but she turned it down because she had been offered a data-entry clerical job. Her family thought she should take the safe option of the job. What a mistake, and one she bitterly, bitterly regretted.