If you want to do video games DigiPen is the place to go. The school is owned my Nintendo and their student projects and their grad stories are amazing.
That being said most people will recommend going for a traditional 4 year computer science degree, and making games on the side. Lots of times your interests will change in college and you may find you like doing something other than game development.
Games are a TON of work (trust me, I know from experience as I make them on the side as a hobby) and require expertise in many disciplines including programming, math, 3D graphics technologies, etc.
In the real world, you'll be specializing in one of these areas but if you work for a small studio or by yourself you'll need to learn it all.
Also, since you added things like animation and video editing I'd really suggest going to a 4 year college where you can try all of these things.
As for what test to take I have no clue what ACT even is, we had SAT scores and that was it.
Don't worry about the prerequisites when applying to colleges, I was well below the average and I still got in. I also had no computer science classes which was a requirement for the computer science program but still got accepted. (My crap high school literally took money they had and instead of building a computer lab and offering computer classes dumped it all into useless sports.)