Our high school district is like that but they are supposedly adding an official additional path which we've seen on paper but not in a course book. Algebra would be in 6th grade and continue on in order. It's something that had to be done since the elementary and middle school district are different than the high school district and the gifted kids in junior high are taking Geometry in 7th grade. On this track kids take multivariable calculus junior year thus completing 2.5 years of calculus.