Airing your concerns in a new school year greeting – you are not a Japanese native speaker
If you have any concerns related to school life, you should inform the school as early as possible. The beginning of the new school year is a good opportunity. In the following message, the parent writes about the fact that she or he is not a native Japanese speaker.
It is not necessary to formally inform teachers that your native language is not Japanese, something that they may have noticed already. However, candidly telling the teachers that you are not a native speaker may be helpful in the long run. Some teachers may have been concerned whether you understand everything that is being said, but may have been holding back from saying anything to you out of politeness. Frankly acknowledging the language issue will remove such constraints, and make it possible for you and the teachers to be frank with each other. You can of course speak to the teacher directly rather than writing in the renrakucho.