How hard is it to break into ib from Edinburgh Uni?

16 year old offered places at worse universities than edinburgh here. Wondering whether to take the extra year in high school and move into Edinburgh for the higher opportunity. Should I take the advantage of having a year on everyone but move into a worse uni? And if not is there a better university in Scotland which could give me a chance at the job. I am open to looking at physical trading / pe / er / im / fm. Just whatever would give a better chance at one of these positions. Would love a bit of advice on what the best path I could take would be. I am predicted for 3A's and 2B'a this year in my highers and I am pushing to network for advice as much as I can.

Cheers.