Quiz questions of different weights / scores / marks
Currently, all quiz questions carry the same weightage: both easy questions and difficult ones have just "correct" or "wrong" as an outcome.
While this is good for a quick quiz, it does not fit well for K-12 courses: some of the questions in the quiz might require more thinking / analytical abilities, and so might need to be given higher marks / weightage than, say, a purely theoretical one-word-answer question.
Please also have the ability to mark a question with a score associated with that question. The total marks for the quiz would then be the sum of the marks of individual questions, and the outcome for the student is the sum of the correct answered marks.