I just wanted to say good luck and that you got this! I've been feeling the same way, your situation is nearly identical with what happened with me on this Oct test and I was having these exact same worries on whether I should take wait for January, but I ultimately do think that the gamble is a big one if we decide to do January. I hope everything goes well for you!

Is there a way to edit the pre-exam block? If I clicked medium, but would prefer long, is there a way to switch?

Yeah, it says host has another meeting in progress for me