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Why can't I guess again after getting something wrong? or atleast tell me what is the right answer?
Steven Parker218,691 Points
Training systems elsewhere may work differently, but the quizzes here seem to be designed specifically to confirm your understanding. If you discover you need reinforcement, you are encouraged to review the video where the material was presented. There's even a "Review Video" button provided on the page for convenience.
This is one of of the things that I think make learning here effective, since just giving an answer is usually not going to help you understand the underlying concepts that you need to know to answer the question yourself.
But if you really feel the training can be improved by doing it differently, the procedure to make suggestions to the staff is covered on the Support page.