I am assuming that the 3 cameras were in sync for the recording? Put the cameras that you think will be used the most on V1A, the next on V1B and the third on V2. Disable V2 until you have the others sorted out. Find a point on V1A that you know is on all the others. Move cursor to that point and set a clip marker ( not a timeline marker, if you don't know how to do this read the manual ) Do the same for each of the clips. Then slip and slide the clips , with a timeline scale of 1/2 sec until the markers line up. Then open up the audio waveform , set timeline scale to 4 frames and remove the clips closer so that the waveforms line up. YOur done.
If you're going to do it directly inside Premiere, do what Ron says. The easiest way to cut between V1A and V1B is to use the Premiere Transition under Special Effects labeled "Take". It instantly switches from V1A to V1B without cutting.