If not you can level the surface using a grinder sander or a tile level system.
Tile is level wall is not.
The horrible gap between this ceramic tile and the wall is not normal.
Create a rough surface to improve bonding.
Once you reset the tiles you need to.
Now going along the wall hold up a tile to the wall and mark on the tile where the line is.
The other alternative is to run the wall tile doewn behind the floor tile with a 90 degree corner there.
The back of the tile should be flush with the wall.
If a wall tile is uneven the mastic holding it in place was not spread properly.
The existing surface needs to show some sort of roughness that will facilitate the bonding between the new adhesive and the old surface.
Use a long straight batten levelled with a spirit level to find the lowest point.
They may have settled or bowed over time or the plaster may be rough and uneven.
If it s straight you can use it to align your tiles instead.
While doing this number your tiles as you go so you will know which tile goes where.
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That way any warping of the tile out of level occurs lower on the wall where it is not so obvious as at the top.
Fixing whole tiles to a wall.
To repair uneven tiles you need to remove the tiles and repair their base.
Take the tiles to the tile saw and make all the cuts.
How to tile an uneven wall.
If you re tiling over an uneven section of wall the.
It is extremely important to level the surfaces.
It s really important to start laying your field tiles so the faces are level.
If not it s time to get cutting those tiles.
The way i would approach this would be to get your top row correct and level then work down to the floor.