Insert a drill for tiles, if there is such an opportunity, put low speeds into the drill. In no case do not put stress drilling mode, this will lead to the split of the tile. We install the drill perpendicular to the tile and at low speeds without pressure, we begin the drilling process. The most important thing here is to have patience, since it is forbidden to accelerate work, increasing the speed, and pressure on the drill, unless you want to lay a new tile. During drilling, you can periodically moisten the drill with water to prevent heating, but it is better to use machine oil.