Yup

Have you ever gotten a 100% on a test?

Yes.

Have you ever gotten 0% on a test?

No

Have you ever been to another country?

No I hate flying so only place I would go is Canada

Have you ever ate grass (not pot) normal grass (just in case someone misunstands)

I can't remember, but I wouldn't be surprised if I had when I was younger. Not recently though

Have you ever had dark bread? By which I mean, this stuff:

well it does not look exactly the same but yes!

Have you ever bought a game and did not even play it?

Yes!

Have you ever been hit with a yellow snowball?

Luckily no...

Have you ever destoyed something on purpose?

yes
have you ever visted another country?

Yes lots of them, UK, Switzerland, Germany, Italy, Czech Republic, Poland, Slovenia, Croatia, Hungary, Romania

Have you ever been to another continent?

Edit: I forgot Liechtenstein