[s8loud]

Indeed, he should be held accountable for what he does, but rather it being a punitive measure taken when he falls short, perhaps do some things with him to show him what could be the results of the (poor) choices he makes. For instance, take him to a homeless shelter to help out and even speak to some of the people to get their stories. Showing him the results of choices he makes could make an impression on him, and hopefully a lasting one.

As far as school goes, it might benefit both of you to find out the root cause of why he doesn't seem to be motivated. If he's bored, you might try looking for other activities that provide a different and related spin on whatever he's studying, just to show him that his studies can be something he can find interesting. Some kids aren't always receptive to today's teaching methods (especially in public school), so forcing them on him when he's already shown some resistance can lead to real disaster down the road. That's why I think taking a different approach might help. The more you participate, the better the situation will become (even if there are some rough patches from time to time). That may ameliorate some of the respect issues you're facing with him as well.

Also, don't worry about letting him fall on his face every now and then. Just be sure you're there to support him if or whenever he does. Again, he'll appreciate and even respect you more when you show that you're 'there' for him.