That being said has he talked to the careers person at school? They vary in quality from school to school (the one at mine is excellent). Have his parents been in and seen the DPs to find out what the issue with his attendance is? What is his actual attendance and is there a pattern, does he miss certain classes, days, mornings? Does he have his level 1s? Literacy, numeracy? (80 level 1 credits with 10 from lit and 10 from num)
At 16, personally if I were you and I was concerned, I would
Have a sit down with his parents,
Ask the school for a copy of his KAMAR attendance (KAMAR is the attendence program which most schools use).
Get his parents to talk to the guidance councilor, careers adviser, whanau/house/level dean and Form teacher
Give your/his parents email address to the form teacher and ask for weekly updates
Request that he is put on a daily (most schools have some form of daily reporting form
Make a deal with him that if he can maintain his attendance above 90% of half a year then ... with a consequence if he doesn't
encourage him to look into part time jobs
have a look at the gateway programme
and only after all this has been tried encourage him to leave school
I know you were simply asking for a web course and you can take my advice or not, but unless the reasons why he is not attending are addressed and some personal engagement in his own future are taken, then you will probably see his poor attendance at school transferred to poor attendance at a course.