I'm assuming this is from Anne Frank's diary. Since a burglary occurred, it meant that the people protecting Anne and the rest of her family were in danger, so, in turn, those hiding in the Annexe were in danger as well. I hope this helps!
A cumulative exam means say that in December you're going to have to restudy whatever you learned back in September. Because that involves spacing, you're going to learn a lot from doing it. Spaced learning is especially important for long-term learning.
Also it would have been better for you to put questions so we can still help you as much as you would like.