out of high school for only about 3 years now...I can understand both of your sides. I was determined to just END high school asap. I didn't even learn anything the last year, except how to turn out fake papers and squeak by with enough to graduate...which hasn't been a benefit to me, except learning to do the minimum in life.
I'd sit down and talk to him, ask him what he realistically thinks of school and what he does and doesn't like. (Maybe have him read "The Teenage Liberation Handbook" --i think thats the title...) School really isn't all it's cracked up to be to tell you the truth. That's why so many kids "give up" on it after awhile.
About the curfew thing, I had to be home by 10 until i was 16 (and could drive) and then midnight till i was 18.... but I managed to just get out of the curfew thing alltogether by convincing my parents that just the fact of having a curfew made me feel like i wanted to stay out later. So when I was 17, (before they agreed to no curfew) I started breaking curfew, sneaking out (and getting caught...but that didn't change much) etc. Finally they agreed to try no curfew. For about a week I came home at all odd hours. Then, after realizing that I didn't even really care to stay out that late, I was coming home around 1, midnight, 11, and even 10. Some nights I wouldn't even go out...because it was getting old.
Of course, I don't know your brother personally, but I can at least understand how he might feel in that position. I was a pretty responsible teen and my parents let me make my own mistakes and fix them, which I really appreciate now...because I can make my own decisions based on my own rewards and consequences. Maybe you can work something out, like having the "rules" be that he come in quietly and not disturb your sleep, or that in exchange for allowing him to make his own choices, that you would appreciate some help in return around the house. And when he doesn't do those things... well, the guilt trip always worked with me. My mom would pull me aside and I could already see the sadness in her eyes as she would explain how "she tries to do things to help me all the time while I just don't give a rats ass. All I care about are my friends and my life, and her efforts don't seem to mean jack to me...and if they did, I had a real crappy way of showing it"
then she'd leave me alone and when she wasn't around I'd clean the entire house...and then start doing my share every day because I realized that I had HURT her more than just made her angry.
just some thoughts from my own teenage years.... hope you guys can work something out