My two older kids attend different private schools which have interesting course progressions:

School 1's most accelerated path:
7th grade-accelerated math (includes some algebra), 8th-algebra (algebra 1 and 2 combined), 9th geometry (includes some precalc), 10th pre-calc (includes Calc AB), 11th calc BC, 12th multivariate calc.

There are several other options for kids to go at a slower pace, including one that starts with 9th grade Algebra I

School 2's accelerated path:
6th grade- everybody in the same class, 7th grade algebra, 8th algebra 2 & geometry (1 semester each), 9th algebra 2 & geometry (1 semester each), 10th precalc, 11th calc AB, 12th calc BC. 1 semester of stats is also required for everybody.

The non-accelerated pathway has algebra in 8th.