The best replacement for chem is ap bio.

The best alternatives to chem are rated as following:
★★★★★  ap bio
★★★★★  bio
★★★  ap physics
★★  biochem
★  biol
★  inorganic chem
★  general chem
★  gen chem
★  cheme
  ap chem
  organic chem
  ochem
  chem
  bioguard

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ap bio
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