Asking helps for by-type argument questions

hey guys I am doing by-type on role questions(argument part) right now.

I go pretty smoothly with easiest and easier questions.

However I get stuck with medium level. I just really wanna ask how I can improve my accuracy on medium difficulty questions. Also one big concern is that there are not enough medium difficulty questions for me to drill. Then I wonder how I know I improve if there is no enough medium questions for me to drill.

Really appreciated if anyone can give me some tips !