Как да помогнем?

Shiverz

Последни действия на Shiverz

Also I know there is the argument that in real, official tests you can't restart. However I find Khan Academy's course challenges a place more to practice your skill sets rather than to actually do...
Same. For me it was my physics course. I dunno where it went, but when I went and looked, the whole course was removed and replaced with another course that I didn't have mastery on.