For Business and Law (assuming English and Welsh law), you dont need any specific A levels (with an essay subject being preferred which you already have with economics). For Economics, you already have maths a level so you would be fine (although i would research unis entry requirements on their weighting for further maths but essentially you will be fine. For Architecture, what kind of architecture are you looking at? If you are looking at the aesthetics, you want to probably go for BA; for functionality and to be an actual architect (not too sure the process that much because I briefly went over it), you are looking for Bsc. For Architecture, I think physics would be beneficial but I dont think it would really matter unless it said so - I recommend checking which course you like for architecture and the unis you might go to.