Thank you for this note, that makes a lot of sense!

I was so close to selecting C, but that "all" threw me off. I'll just have to keep an open mind with that next time.

I do each level and I do not move forward until I receive a 5/5 multiple times, just to ensure the first one wasn't a fluke.

It depends on the question for me. However, I have found it really helpful to review the simple examples over and over to drill the idea into my mind. It may feel redundant because you may feel as if you already know the answer, but push that knowledge out of your head. Take the simple sentences down bit by bit and give yourself a thorough explanation as to why each piece moves the way it does. The smaller questions are easy to brush off, but they are a tremendous amount of help!