I,have to flush toilet twice,before everything goes down.I tried using plunger and a snake,no results.help

Sounds like the problem may be in the toilet tank... believe it or not.

You want the water level in tank to be about 1/2" to 1" below the overflow pipe, you want the flapper chain to have about 1/4" "jiggle" room before finally engages flapper via handle, and you want to be sure the REFILL TUBE from the fill valve is sticking into the overflow pipe, sending water down to bowl.

See pics. Below to understand what each thing I mentioned is.

It could also be that the siphon jet at bottom bowl is clogged...or holes UNDER rim are clogged, but no need to clean now... check out the things mentioned.. see from there.

Let us know what you find... Mark

I have one that most repair plumbers miss.. Look down at the bottom of the bowl. If there is a small hole, then that is a jet that starts the syphon action. If it's clogged the water will just swirl around and slowly go down leaving solids behind. Take your finger,(UGH! ) and run it around the inside of the opening. Over the years minerals build up and cut down on the syphon (flush) action. If it is rough or you feel build up, take a table knife and put a bend in it to get around the curve in the bowl and chip and scrap it clear. Next take a coathanger and clear out the holes around the rim. They start the swirling action. And last, check the water level in the tank. It should be 1/2" below the top of the over flow tube. And speaking of the overflow tube, Make sure the small 1/8" tube from the ballcock to the white overflow tube is connected so it discharges in it and that it's flowing when the ballcock fills. This is what raises the water level in the bowl. For a good solid flush they all have to work together. Hope this helps . Tom