P.P or P.S

I was doing some exercises abou Present perfect when I found this dialogue:

-______ you _______ your exams at school? (finish)
-Yes, I ________ them last week. (finish)

I first completed the gaps with Did/do and finished, but then my teacher told me that the correct tense of the question would be the P.P : Have tou finished your exams?, but the answer would still be the same. I'd like to know: shouldn't the tense of the question match to the tense of the answer? in this case as in the answer it has a defined time I should use P.S, so shouldn't the question also be in this tense? In case the question was given using the P.P SHOULDN't the answer be given also in this tense? (although it could't happen because of "last week", whereas if it were "this week" I guess I could use the P.P)

Thanks in advance!