Whats 439 ucas points in GRADES?
Ok that is an average of what the students who go there have, it is not the required grades (which is why it is such an odd number). It indicates that whilst they may ask for somethink like AAB which I think would be 340 a lot of the people who go actually have 4 A-levels with decent grades in them all. This is roughly AABB at A-level. What you actually need to do is search their website for undergraduate courses, find the one you want to do and it will give either “entry requirements” or “typical offer”. If you think you can meet this then it is probably worth applying, although you should be aware UCL is one of the UKs more respected unis and so not everyone capable of getting good enough A-levels will get an offer.