The dialogue is about seeking advice for an upcoming exam. The first blank is already filled with 'advice'. The second blank requires a verb that fits the context of preparing for an exam. 'Do' is the appropriate verb to complete the question 'What should I do?' in this context, as the girl is asking for suggestions on actions she should take.
Girl: I need your 1 advice. I've got an English exam next month and I want to do well. What should I 2 do?