Sorry to hear of these issues. I think 15/year 10 is another transition age, with lots of changes and pushing boundaries. One piece of advice that I like is to keep screens out of bedrooms, particularly after bedtime. Our guys need to put their devices on chargers in the living room, before going to bed. And during the day, they aren't allowed to spend too long on their screens. In terms of motivation, we had similar issues and spoke about respect, independence and responsibility going hand in hand: do the right thing, and you'll get more respect and independence. Independence is a big thing for this age. We explained that to get independence (go travelling, uni, work etc), you need to get the grades and finish high school. Try reminding him of all the good things that he's done and is doing (work experience and other achievements). Make sure he has other outlets to relax, too (friends, sport, music etc). Finally, try to stay close to him, emotionally - make sure you check in with him about how things are going for him - don't make a big deal of it, but just casually and briefly check in with him every couple of days. Best of luck.
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