Two consistent observations or a two-of-three pattern are required at each gateway.
Adaptive placement · four separate strands
Find a useful starting region, not a label.
Choose a familiar course landmark. The check will move up or down separately in number, algebra, geometry, and data. Every decision requires at least two probes; a split result gets a third.
Your results can point to different course regions in different strands.
Placement is an initial map. Independent practice provides richer evidence over time.