Hey!for tc interviews, do they consider u holistically or is it all based on the final interview ahhaha feel like i smashed the other stages but fucked the last bit
I'd say that it likely differs from firm to firm, so there isn't necessarily one fixed answer.
However, many firms do take a holistic view of your performance across the whole process, so doing well in the earlier stages definitely still counts. While the final interview can carry a bit more weight, I think it is unlikely that one slightly weaker performance would completely undo an otherwise strong application.
It is also worth remembering that we tend to be much harsher on ourselves than interviewers are. What feels like a bad interview on your side can often come across as perfectly solid (or even strong) from theirs!
For what it's worth, in one of my own final stage ACs I was convinced I'd messed it up because I ran out of time on a written task - but I still ended up getting an offer. I really wouldn't assume the worst!
Wishing you the best of luck - I hope it works out for you!