What are my Chances for UCL psych with language sciences?

i meet all the requirements but theyre a bit below the avg i think

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8 in maths, i got the two 6s in science and i got a 7 in english language

You clear the minimum entry requirements so you ought to have a reasonable chance to get in. Good luck!

UCL offers two courses, one that's 3 years and AAA requirements and one that 4 years but A*AA requirements. I have already applied to the 4 year one, are my chances of getting in good enough or should I swap to the easier 3 year one?

Just to note on this topic, very often at unis where there are integrated undergraduate masters versions as well as bachelors versions of the course will consider applicants as a gathered field, and applicants for the 4 year courses that they think may not quite reach the threshold for an offer for that course may be made an offer for the 3 year course instead. This may vary from uni to uni and course to course but it's common enough that I don't think it's unusual for unis to take that approach. So I don't think it's worth switching on the off chance they may not do that, and also if the 4 year course is what you want to do you may as well just apply for it directly (as swapping from the 3 to 4 year course while normally straightforward in terms of the admin process at the uni, can impact your SFE entitlement, so in my opinion for UK/home students it's usually better to start on the longer course if uncertain).