YOU SAID:

I dont want to go to school tomorrow

INTO JAPANESE

明日学校に行きたくないです。

BACK INTO ENGLISH

Don't want to go to school tomorrow.

INTO JAPANESE

明日学校に行く必要はありません。

BACK INTO ENGLISH

You do not need to go to school tomorrow.

INTO JAPANESE

明日学校へ行く必要はありません。

BACK INTO ENGLISH

You do not need to go to school tomorrow.