I have a question about the weekly pretests. How exactly are they graded? Are they similar to an actual test, or do you just receive full points if you put some effort into them? Or is it something all together different?
They aren't graded, you receive a small credit toward your final course grade based solely on participation. The purpose of the pretests is to help you start thinking critically about the new topics being covered in the tutorial sections. The solutions of the pretests are usually discussed during the tutorial sections in the context of that week's tutorial.