How hard are Study.com Finals?

[mysonx3]

Just started taking my first Study.com course (American Civil War Era), and it's one of the ones with a practice test, so I took it and was pleasantly surprised to have gotten "mastery" over 40% of the material (I was under the impression 30% was the max).

I'm a little concerned that skipping over the quizzes I don't take will hurt me on the final, so I'm wondering how hard the finals are and how well they usually match the content of the previous quiz questions?

I know I don't need to do particularly well on the final to pass (by my math, if I max out the quizzes and get 70% on the projects then I only need 40% on the final to pass), but I'm still wondering if I'll have trouble with the final on account of skipping some of the quizzes/lessons.