Choose whatever you want! Even maths doesn’t matter. I personally had a NG package, and got into the study just fine. We don’t look at what subjects you’ve had, but at what kind of fun projects you’ve done outside from school. For example, my portfolio that I sent when applying was just a bunch of fun sketches that I did during my classes, a scuffed 3D model, some small Scratch games, and pixel artwork. None of these were made as a result of the subjects I had at middle school.
Just make sure you pass your classes, and have fun! That’s what middle school is for if you want to get into CMGT.