I am slightly puzzled with this thread. There are students of all personality types who maybe should not be flying not just type A personalities.
I presume you mean 'should not be flying PIC, alone or with passengers'?
The OP seemed exasperated at the poor quality of this chap's flying and his attitude after 45 hours- Well, SOMEBODY allowed it for 45 hours which proves my point that you must blame the school for not putting their foot down if they were really that bothered!