I know two things about this plant 1 is that it does not need to be watered for a long time because it has been able to survive in my schools greenhouse for quite some time without water and 2 my teacher says she "thinks" it blooms purple or pink flowers. Thank you in advance for any help given!
I'm no expert on plants but it could be a kalanchoe. That's based mainly on the leaf characteristics and size.
There's some 120 or so species mainly originating from the old world. These are quite drought tolerant as yours seems to be. They are a common houseplant and there are ways to stimulate reflowering so that also makes it a good candidate.