The best replacement for algebra 2 is geometry.

The best alternatives to algebra 2 are rated as following:
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★★★★  college algebra
★★★  algebra 2 trig
★★  algebra 1
★★  geometry first
★★  calculus
★★  precalculus
★★  algebra 2 honors
★  geometry after algebra 1
★  trigonometry
★  intermediate algebra

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Speaking about algebra 2, one probably shouldn't forget about trig.

Other search terms related to algebra 2 and their ratings are:
★★★★★ trig
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