I can empathize. One of my old friends was killed in a car crash, and it wasn't because of his error - which made it exponentially worse. The best advice I can give is not great advice, but I'd advise you not to dwell on it too much, even if it seems difficult. Condolences.
These accidents seem to be more commonplace in the latter years of high-school as dj_de pointed out. I can cite several examples of people in my class dying just this year.
Reviewing the facts made me see I'm not viewing this as a tragedy anymore -- and it sounds cheesy, but as a learning experience.
I'm glad you can take something away from the situation that isn't entirely negative. I don't have a ton of experience with death but I do know the shock of it can promote communication and understanding for those people that aren't even immediately involved. I'm hoping your school environment improves as the days pass and that your dreams are pleasant. Hang in there, baby.
My friends sister (The guy introduced me to Half-Life. If it wasn't for him I wouldn't be talking to you today! ^_______^) died from anorexia, which is heartbreaking because she was nice, beautiful and all her friends knew she was anorexic and refused to get her help.
A guy who was a total douche died by skiing where he shouldn't have. His girlfriend hooked up with one of his friends at his funeral. Quality people.
I probably have a different angle on death too the rest of the British public, I used to spend 6 months of the year just milling around the Hospital ENT ward and sometimes ICU or Cancer units. My Mum is a Ward Sister and part of the General Management, my first experience of death was talking to a guy on the ward, he'd been attacked his eye's had been gouged and was just generally in a bad state, he died while I talked too him. I was too young to understand and just walked off.
The next time I found my Mom trying to pull a dead guy out of the toilet after they collapsed in there. Again pretty young I decided to go help not really knowing what had happened. Hey I paint a pretty picture for the NHS.
After that I stopped going to the Hospital and life was pretty death free my Grandma got cancer of the mouth in 01/02 that was pretty severe she didn't take kemo for it either. I wasn't sure how I felt, just felt like any other day. After she passed away I started dating a girl and found out her Mum had cancer, that went on for 3 years till this day, she passed away before Christmas last year.
None of these events made me feel any less different than I do today. My friend was murdered May of last year, I still visit his memorial every year and occasionally I try and say something in Arabic for what little it's worth I figure he'd like too hear that.
What you can take away from this Cat I dunno.
Float on.