In my NAB I can remember labeling a coastal diagram, wasn't hard at all!
Just memorise two or three features just now for each topic i.e. for coasts arches/stacks and then a feature of deposition, spits. Make sure you can do the diagrams though.
For hydrosphere, I expect it will just be the hydrological cycle which is easy to draw and explain the processes. Hydro-graphs are ok aswell, some questions basically so if you've done a few you'll be fine.
What is your description of the features like, have they been getting full marks?