Is it okay to do bad in Year 13 Mocks

does it technically matter in the long run- no, not really, it doesn't count toward anything. also, it doesn't matter what your teachers think because (and this is a bit mean but true) you've already got predicted grades and they can't be reversed.
should you be worried- the harsh answer is probably yes. it shows you where you are currently at in terms of if you gave the exams with your current knowledge, that is the grade you will get. people say that it's just mocks and that they'll revise for the real thing, but what i've found is the people who said that for GCSE actually didn't end up doing much for the real thing either, and then severely regretted it.
however, it's over now, so there's no need to stress over it. take the hit and learn from it! are you applying to university? if so, imagine your dream university and decide that with an E you're not getting anywhere.
you have four months! people can go from an E to an B/A in that much time if they work hard enough! so a bit of worry will feel awful, but i think will probably be a good thing to keep you motivated.

I think I am going to do really bad on my alevel mocks and I dont know what to do.
I took psychology chemistry and biology and I havent revised at all for it but a bunch of people I know have said that the winter mocks do not matter - like people in uni.
I think that im going to end up getting an E in chemistry and im just scared of what my teachers will think because I honestly havent had time to revise for chemistry.
So bc of this I have been drilling biology and psychology into my brain so at least i can get a good grade in them to kinda balance out the good and bad grades…
Should I be worried if I do really bad in these mocks??

Yep ive applied to uni and i got 4/5 of offers and just waiting for one more
I feel like im going to get an A in psychology and a in biology
Im just worried that this E in chemistry will take a massive toll on me because i havent revised for it at all

I think I am going to do really bad on my alevel mocks and I dont know what to do.
I took psychology chemistry and biology and I havent revised at all for it but a bunch of people I know have said that the winter mocks do not matter - like people in uni.
I think that im going to end up getting an E in chemistry and im just scared of what my teachers will think because I honestly havent had time to revise for chemistry.
So bc of this I have been drilling biology and psychology into my brain so at least i can get a good grade in them to kinda balance out the good and bad grades…
Should I be worried if I do really bad in these mocks??

well if you haven't revised for it at all then there's your issue. there's no point in allowing it to take a massive toll on yourself- i would understand that if you'd put in a lot of work and still not come out well. but you didn't which is going to reflect in your result. for the real thing, you'll know that you need to put in the work, and get a good grade- like for bio and psych, you said you revised and now you think you're going to get As. move on and learn from it rather than lingering on it and wasting time that you could spend getting better at it.
also, congratulations on your 4/5 offers! that's incredible!