The sky is the limit!! Get off on the right foot. Every decision you make will affect your future. Not doing homework results in lower grades which in turn results in lower GPA and that could prevent you from getting into your DREAM school. Work hard and get help when you need it. Don't wait until you are near failing or assigned an AIC to ask for some help. Be proactive and talk to your teacher anytime you feel like you're not "getting it." 

Get involved in school. Don't tell yourself, "I will do that next year." Get a list of activities and clubs from the guidance office and put yourself out there. 

#1 thing to always remember...

ASK QUESTIONS:)