what's the point of quizzes if i cant see where i was wrong? is it somewhere on the site?

It all depends on the quiz. Sometimes the quizzes will give you a hint, sometimes they will refer you back to video. The whole point is to make sure you have a good handle on the material. Listening carefully to the video should give you the concept you are missing. If you can't figure it out completely, the forums are here so you can get help from your peers or moderators.

Hope this helps!

I'm not entirely sure what you mean by your question, but I'm going to guess that you are talking about passing the quiz while still having a wrong answer. (If this isn't what you are referring to, please expand on your question)

If this is the case, you always have the option of doing the quiz again. I've often done one more then a few times until I get the correct answer. If you are still stuck, you can post a question (exactly as you've done here), but in the body of the question, copy/paste the quiz question you are stuck on, and someone in the forum will be able to help.