The ETS page on Naver has information about how young-ish people in Korea can get financial support to cover their TOEFL test fees. Applicants should be unemployed (or perhaps under-employed).
Support is currently available to residents of five districts in Seoul, and to residents of various cities across the country. Keep an eye out for more participating cities, as the program was much larger in 2023.
In general, applicants can receive up to 100,000 won… which I think is equal to about 40% of the total test fee. Details at the link above. I believe the same program can be used to get financial support for other tests, but I don’t have much information about that.