Socrative is a site where as a teacher you can form quizes for you students. After forming a certain number of questions you are given a room number this way you could use different rooms for different classess. You can also save the quiz for later so you could use it again. You also have an opportunity of following each student as they take the quiz and you could give feedback. The other thing we learned was how to use QR codes. We were told to make a worksheet using a QR code. It was very fun, this is the best thing I learned so far. Every students has a smartphone or has a close relative that has one, and they really love to use them.