How to select vertices which are overlapping? I got some Vertices Overlapping, after using "Srew" function (:D) 



How can i select the vertice, which is beyond the other? Look at the cursor there are 2 Vertices overlapping but i need to select the one beyond the vertice which is in the front
You need to enter wire frame mode Z or turn of limit selection to visible:

 When in one of these two modes, you simple select the vertex, if you got the wrong one, select again, without doing anything.