Struggling in AP European history?

Hi, i’m a junior and this year i’m taking ap euro. I seem to be struggling on the quizzes and tests,usually getting a C which is unusual for me, especially in history. Last year in AP World i had a 97 average and had no problems. I’m in APUSH at the same time and consistently getting 100s on quizzes and tests. On the tests/quizzes in ap euro,my teacher uses questions that test obscure details and i’m not exactly sure how to study for it. Any tips?