@Ikaarin I think we’re using “necessary” in slightly different ways. In conditional logic, when we say X is sufficient for Y, we mean that Y is necessary for X. Meaning whenever X occurs, Y must occur. That doesn’t mean Y requires X in all cases. So brain death →death means that the occurrence of brain death guarantees “death” but “death” doesn’t necessarily guarantee that “brain death” occurred. Death could be the result of any other thing.

Hi I would like to join! I am very new to the process. I haven’t yet taken a practice test but plan to in the coming weeks

Ok, so this is how I've been viewing it but idk if this helps or hurts me.

Another way to think of it: sufficiency guarantees necessity not the other the way around. Being a cat guarantees being a mammal but being a mammal doesn't guarantee being a cat.