I love how Khan Academy keeps track of student work and percentages. Also, the simplicity of the whole design/program. Very user friendly. Easily assign work to the whole group or specific students. Review collected by and hosted on G2.com.
I wish there was a fast forward option on videos/lessons only in teacher mode. So we could skip around to see if we want to use it but students could not. Review collected by and hosted on G2.com.
