I don't know, but you're not going to be successful at real math without a lot of practice. The PISA exam is a joke and looks like 6th grade math. http://www.o

I don't know, but you're not going to be successful at real math without a lot of practice. The PISA exam is a joke and looks like 6th grade math. http://www.oecd.org/pisa/test/PISA%202012%20items%20for%20release_ENGLISH.pdf http://www.oecd.org/pisa/test/PISA%202012%20items%20for%20re...