Does job role and CV matching necessary?

26F, recently passed out of m.com, acca (7/13). I gave only 2 interviews till now and the roles were of tax but my cv includes an experience of audit and assurance from a CA firm.

It was basically 3 months of internship 3 yrs back.

But these interviewers grill me very hard on this internship experience asking questions which I cannot ans because of. 3 months is nothing for core audit questions.

What shall I do please suggest me guys. Shall I remove this experience, if so then my cv becomes blank.