The main focus of this course is your indpendent project. It is important to be able to focus on and create SOMETHING. It is also important to figure out how to do something ON YOUR OWN without a teacher showing you how to do everything.
It is OK to change your mind and switch, but you do need to fill out the form again. It is also OK to have a second project you are doing with a friend, as long as you have an indpenendent project you can work on when your friend is busy.
If there are only fifteen minutes left of class, and it doesn't make sense to start on your independent project, you may do one of the following:
Create animations in Scratch
Create video games in Scratch
Create something else in Scratch
Work on Tutorials in Scratch
Draw in Scratch
Code.org
Work on 3D printing
Work on Lasercutting
Read
Draw