YOU SAID:
tomorrow is my chemistry exam and I don't know anything
INTO JAPANESE
明日は化学の試験だけど何もわからない
BACK INTO ENGLISH
I have a chemistry exam tomorrow and I don't know anything
INTO JAPANESE
明日化学の試験がありますが、何もわかりません
BACK INTO ENGLISH
I have a chemistry exam tomorrow and I don't know anything
You've done this before, haven't you.