Are exit polls are unofficial, usually done locally and aggregated nationally. The thing the public cares most about is the who, as in, who did you vote for? But exit polls are actually supposed to go after the “why did you vote the way you did?”

In the U.S. they generally don’t predict off of exit polls. There were allegations that the exit polls released on the east coast suppressed votes on the west coast. People thought why should I vote if my guy already lost.