As 2Pack says, hammer and chisel is the job. Make sure to wear a pair of goggles as chips off the tiles may fly.
We had to take up tiles on an old kitchen last year - those nasty honeycomb ones with the little square tiles in between. Can be tricky enough as most of the tiles broke so was slow-ish to get them up. Trick is to hammer the chisel in a good bit under the tile and they *should* pop up.
Getting the ply up was another matter! Had to get a crow bar under it and jump up and down on it to get it off. Again, it all splintered so we had to go at each piece a couple of times. For this part, make sure you wear gloves - we ended up with blisters on our hands
Have fun
D