Posted: Today at 15:26
No. 1 looks like an Echevera - a succulent as Loana says - needs well drained soil and sun. No. 3 is also a type of succulent - name escapes me at the mo but after cleaning it up, same treatment as No. 1.
No. 2 looks more like an evergreen fern - if so, the reverse treatment/conditions would suit - dampish and light shade.
May be worth turning all of them out of their pots and checking their roots and repotting in the correct medium as necessary.
Your first job tho may be to exchange your flat mate for another