YOU SAID:

I have to take the SAT test tomorrow at seven thirty in the morning and I have to be in the testing room no later than that time

INTO JAPANESE

私は明日の朝7時30分にSATテストを受けなくてはならないし、その時まで遅かれ遅く試験室にいなければならない

BACK INTO ENGLISH

I have to take the SAT test at 7:30 tomorrow morning and I have to be in the exam room late until then.

INTO JAPANESE

明日の朝7時30分にSATテストを受けなければいけないし、それまで遅くまで試験室にいなければならない。

BACK INTO ENGLISH

I have to take the SAT test at 7.30am tomorrow morning and I have to stay in the exam room until late.

INTO JAPANESE

明日の朝7時30分にSATテストを受けなくてはならないし、遅くまで試験室にいなければなりません。

BACK INTO ENGLISH

I have to take the SAT test at 7.30am tomorrow morning and I have to stay in the exam room until late.