Oh wow that’s a lot of questions 😅 I’m definitely not the best person to ask but I’ll try my best
There isn’t really a shortcut to getting As/A*s , but you did well at AS Level so just continue working hard! Past papers are really helpful, especially in maths. And try to start making notes early, so it’s easier to revise in the summer
In that case, I can’t say for sure but I don’t see anything wrong with taking econ+finance. The course seems to have the core econ modules so that looks fine to me. I’d say make sure you like the look of the mandatory finance modules though! You shouldn’t choose a course you like less over another just because the entry requirements are lower
For the necessity of MSc, it depends on what career you want to go down I think. E.g if you want to go into investment banking, it’s not needed. When you start uni, you usually apply for a ‘spring week’ in the first year, and for ‘internships’ at the end of the second year. If you do well in them, you can get invited to continue working after the third year of uni is finished. So you can basically go straight from uni to working without the need of an MSc. But if you fail to land a placement once uni is finished then you’d have to apply for the waaaaay more competitive graduate scheme. So in that case an MSc is useful to boost your CV.
But if you want to be an economist then a masters is very very helpful, if not needed (sometimes even a PhD).
In summary you shouldn’t be deciding whether to take an MSc or not yet since you don’t know what career options you have open at the moment!
Assuming you have A*AA predictions and a strong personal statement/reference, I’d be shocked if you didn’t get into Loughborough.
I know someone who got into Leeds for econ+maths with AAA predictions so take that how you will! (Doesn’t seem like you need to really exceed the entry requirement, getting the minimum also seems ok, so I think you could definitely get a Leeds offer)
Bath, St Andrews and Bristol are a bit more competitive to be honest. St Andrews only require AAA but I know someone who got rejected with way way higher predictions. And the number of students at the uni is smaller than most. Apparently they favour Scottish/internationals more too, but that’s just what I’ve heard so don’t take that as 100% truth!
I think you should research the admissions rate of Bath and Bristol, because I’m not sure :/
I know a lot of Oxbridge/LSE/Warwick/UCL rejects (or even a few people who got offers) who are still very good go to Bristol because it’s arguably the best econ uni in the tier below and the city is very nice! So Bristol might be quite competitive.
So definitely research the admissions rates and make sure you apply to unis with a range of different requirements/entry requirements! E.g. Warwick, UCL, Bristol, Leeds, Loughborough
Sorry I’m not the best person to ask but I hope this helps