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Depends every school is different. I can list the basics b for math though. Check this website out they have all the basics you basically need to know. http://www.aaamath.com/grade8.htm
by be smart? you may skip subject but grade is a whole different story
I personally don't think you should try to. I know middle school sucks but just deal for one year. In highschool its much easier to graduate early. Just do a lot of classes. My school had 7 classes a day but you can take online classes to finish early and if you have good enough grades and your school does this you can do duel enrollment. I suggest that over graduating early if you can because it pays for your schooling and saves you money. There has been people who have graduated from college before high school