If your only a Junior, can't you make it up in the next few years? If not a GED will work for you by the sounds. Just get your act together and maybe smoke less bud if that's what's fucking with you. You could always turn to behavioral problem drugs like Ritalin, Adderal or Dexedrine; however I recommend staying away of Dexedrine, or any of those for that matter but they may possibly help you. I don't really know what to tell you as I'm not even in High School yet so I don't really grasp the concept of your situation, in any case: good luck dude!