This post is not purpose to offend anyone, just want to express some of my opinion about these schools that you posted.
Bellerbys: This college is not so bad but also can not say it s good. However, only one advantage I can see from this college is that you can choose the place where you really want to enjoy studying. Because this college contains 3 different center London, Cambridge, and Brighton.
Ox Brookes: I heard about this college before through a particle about a new style of University studying in England, indeed, they just applied the American style to this UNi. But in my point of view, this school doesnt have really good reputation among Uk Universities. The ranking is quite low, bottom part of the UK ranking. But If you really want to make a safety choice in your Ucas form, this one is such a best option.
Besides, Concord, CTC, Asbourne which i had posted in the previous one, I think other schools which are good for A-level and recuit VNese students every year are Abbey - London, Camb, Birmingham ;Bellerbys (like what I have posted); Rossall (such a boarding school and having a very strict study rule), People's Col in Nots(Having quite a lot of VNese), etc...
And if you really wanna prepare for your Universities, I highly recommend you some of these below Unis:
For Econ: Camb, LSE, Bath, Warwick, Royal, UCL, Birmingham
For Science: Imperial, Warick, Camb, Loughbrough, Man(UMIST)
For Social Science: LSE, Camb, Ox,
By the way, i have posted somewhere in this club the ranking of England Universities and Colleges for A-level course. I think you can consult about it and make your own decision
Good luck