Finding a good low entry requirements UK university

I want to apply for the first year of Economics and Finance, but I'm having trouble finding a good university that has low entry requirements. In high school, I did okay. I got a SAT score of 1190 and came in first place for Physics and Astronomy at the Copernicus Olympiad in the US. I also won a gold medal at the Pangea Math World competition in Germany.

I'm struggling to find a UK university that's both decent and easy to get into for the first year. Is there a university that fits these criteria? Also, is it possible to study for a BA at an ex-poly university and then study MA at a Russell Group school? Thanks.

It works the same way as supply-and-demand works in economics. The best universities are in high demand. That demand drives-up the "price" universities can request in terms of grades. Hence the best universities have high grade requirements.
A reasonable approach would be to look at the best universities your grades can "buy" you, and see which you prefer.
The answer to the question in your last sentence is "Yes".

I want to apply for the first year of Economics and Finance, but I'm having trouble finding a good university that has low entry requirements. In high school, I did okay. I got a SAT score of 1190 and came in first place for Physics and Astronomy at the Copernicus Olympiad in the US. I also won a gold medal at the Pangea Math World competition in Germany.
I'm struggling to find a UK university that's both decent and easy to get into for the first year. Is there a university that fits these criteria? Also, is it possible to study for a BA at an ex-poly university and then study MA at a Russell Group school? Thanks.

As already said all you can do is to check individual universities and check your qualifications against their international requirement for our country. Generally for the USA they are usually based on APs. If you have any queries email the university with your qualifications and they can reply.
Basically top universities require very high grades and the less popular the lower they will accept.
To help you look into this I have included the Complete University guide table for Economics.
One of the issues you do need to consider is that universities in London tend to be oversubscribed due to the demand in particular for overseas students to be in London. Provincial universities dont generally have the same demand and the cost of living is lower.
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This is the general table you can access individual subject table off this.