How many chances do we give?

My grade nine student Andy did minimal work in the first half of the semester. He earned a mark of 35% . His attendance was intermittant. In the second half of the semester I encouraged him to attend more regularly and finish the work. He attended, started most of the work, but did not complete much. He was pleasant, often asked to be excused to "go to the washroom", and sat at the back quietly. He was socially connected with a couple of boys in the class and had struck up a romantic relationship with one of the girls who sat on the other side of the room. This relationship did not interfere with the learning environmnent. He was friendly and we got along fine on a personal level. As the semester was coming to a close, I tried the following:
a. I called home, spoke to the dad about my concern and asked for his support in getting his son to come in once a week for extra help at lunchtime.
b. I offered Andy extra help and said clearly this would be his key to success.
c. I registered Andy for the school-wide catch up days.
d. I asked him daily for outstanding work.
e. I gave him mark printouts and highlighted the work still not submitted and made sure he understood what each piece was and what it was worth.
f. I arranged to work with him after classes had ended for as long as it would take to pass the course.
Unfortunately, Andy always had a reason for not coming in for extra help and in the end handed in a fraction of the work a day after report card marks had been entered. He failed the course.
What else would you have done to help Andy?

Everybody pays

A colleague of mine was running a test in her grade 10 French Immersion classroom and one of the highest performing boys repeatedly spoke out during the test. When the teacher warned him of the consequences for disrupting the test environment, he challenged her, claiming she was singling him out unfairly. This was not an isolated event. The teacher felt she was not able to resolve the issue. She called the vice-principal in. He came in during the next test and said that if any student spoke out during the test everyone in the class would receive zero.
Is this an effective intervention? Will this create an appropriate form of peer pressure, or will this unfairly penalize the innocent students?