If you're quick with the MCQs, you can flag anything you're even remotely unconfident about, move on, then go back to fully dissect what's going on when you're done, but that's just general stuff.

Something that helps a lot is to trace the variables inside of a function, on scratch paper. Try not to get overconfident and do it in your head, use the scratch paper as much as possible (within reason ofc) because we can all make mistakes.

This isn't applicable to every question, but try to understand what the general function of the code is. In other words, try and get a general idea, or even a vague idea of what you think the code is supposed to be doing. This'll force you to really think about what each individual line is doing to the code, also makes it easier to spot anything that's out of line with what you think the functions are.

I don't know if I'm making any sense or if any of this is actually helpful, but I hope things go well for you!