I am not sure about your level of research. However, "Comparative study of Impact of different teaching methods on childrens". You can include the country name in the study also.
Love both of those@ShirshenduRoy and @GStephen. Not sure what your passion is or the age range you wish to study Charisse but in a time such as this: How important is SEL in the time of COVID19 and Virtual Learning? How can Antiracist principles be introduced in the existing curriculum? Study about some of the areas in which language problems manifest themselves in older children. You can focus on language acquisition, language deficits, or use a broad range. Good luck.
Educational or psychological research? Children age? Mainstream or learning difficulties?Your level of research? Your interests? I think you should answer yourself to this question.