Need help with Straighterline courses?

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I am currently working in U.S History Straighterline course, I want to pass the course with an "A" and I am preparing for the midterm which they only tell the students to study for chapters 1-8. I really am worried because it is 250 points and I need to pass it with an "A" could you please give me some pointers of what I should study for the Midterm, how would it be?, is it more focused on something specifically?. Or what can I do to prepare myself to pass it with an "A"? I appreciate your honesty and help. Thank you for all your help, God bless you.

Midterm is mostly made of the tests you took before it. So it will only cover the chapters you already tested on.