The best replacement for esol is esl.

The best alternatives to esol are rated as following:
★★★★★  esl
★★★  tefl
★★★  efl
★★  ell
★  life in the uk test
★  life in the uk
★  ielts
★  tesol
★  literacy
  trinity tesol

Your alternative for esol is not listed? Suggest!
Speaking about esol, one probably shouldn't forget about citizenship test.

Other search terms related to esol and their ratings are:
★★★★★ citizenship test
★★★★★ citizenship
You have in mind a companion for esol and it is not yet here? Propose!



Google Trends

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esol
esl
tefl