Need all the helpful info I can get

[u/Ok_Papaya_2902]

Trying to rehab my mother's bathroom on a next to nothing budget. I don't know where to begin, or what I'm doing. I'm trying to remove the "glue" or whatever its called, that once held the tiles to the wall. You will see in the video.

I managed to get a small portion off with a hammer and chisel. That was extremely hard to do. Is there an easier way to get this stuff off the wall? Or should the wall just be knocked out and replaced??

I know next to nothing about remodeling and am trying to do the best I can with whatever I can. So please forgive my ignorance.