Could you correct these sentences

I'm wondering whether to take a bath.
風呂に入るかどうか迷っている

The exam was not as difficult as I thought. This is fine but you might want to say..as I thought it would be.
思ったほど試験は難しくなかった

What is the difference between this and this? I assume here you are able to see or pointing to the things you are referring to? That's fine. Meaning this thing and this other thing. 
これとこれの違いは？