Buddhism quizzes and how I did

This Britannica quiz I got 5/6, I missed the question of who brought Buddhism to Korea. I won't give away the answer.

I got 86% right on this How Stuff Works website, the average is 70%. Not sure how I got so many wrong.

I got 94% on this one. It doesn't say which ones you got wrong. I didn't like the question about the two main Buddhism, I think there are 3.

100% on this one.

Didn't like the interface of this one: https://quizizz.com/admin. It wouldn't let me guess the answer and keep my score, and if I toggled see the answer, when I clicked to the next one, it would show the answer. Maybe some good quizzes. Plus you have to sign up for this bad interface.