Anyone having trouble with High School?

I'm scared out of my mind for High School (I'm in the 8th grade now). it's turned my sister into this stress maniac. o.o

And what's worse about it is that I'm in all of the smart classes. I'm taking 9th grade math, 10th grade science and I'll most likely be in advanced English next year. ._.

8th grade is a lot harder than 7th, which I cruised through without a problem. The biggest thing is the homework. ;-;