SAT 数学（学习）SAT Math (study)

学习建议与专题说明（非练习模块入口）。完整套卷请从侧栏年份进入。Study tips and topic notes — not a practice module. Full tests live under the year sidebar. Coming soon

代数与函数Algebra & functions

占位：核心题型与易错点。Placeholder for core types and pitfalls.

几何与数据分析Geometry & data

占位。Placeholder.