Different languages have grades to show how difficult they are to learn for a native English speaker. For example most [west] European languages are grade 1 as these share the most similarities with English. These two links will hopefully be helpful:
https://www.fsi-language-courses.org/blog/fsi-language-difficulty/
https://2009-2017.state.gov/m/fsi/sls/orgoverview/languages#:~:text=Category%20I%3A%20Languages%20closely%20related%20to%20English.&text=Category%20II%3A%20Languages%20that%20take,master%20than%20Category%20I%20languages.&text=Category%20III%3A%20Languages%20with%20significant,or%20cultural%20differences%20from%20English.&text=Category%20IV%3A%20Languages%20which%20are%20exceptionally%20difficult%20for%20native%20English%20speakers.
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