Transfer to Oxbridge-2nd year for physicsWatch
"Cambridge Colleges will only, as a matter of principle, consider applications from students enrolled in a degree course at other UK universities in very exceptional circumstances.Any application to study at Cambridge would need strong support from your Course Director or other academic tutor at your current university. A reference or letter of recommendation from that person to the Cambridge College would be required, and only then can a Cambridge College consider an application. All such applications are still subject to the same academic assessment as any other application to the University.We do have a system of admitting graduates from other universities to do a second undergraduate degree as an affiliated student at Cambridge, in which case the course takes a year less than usual."
If you're not really bothered then just take the offer you want from the ones you have
Is it possible to transfer from another university to Oxbrdige in the 2nd year ?
This is likely to mean a reason that is as exceptional as your first university having discovered you are a second Einstein and cannot cope with your precocious talents (and that is unlikely in the extreme), or that you will die if you do not transfer. It will not include the situation of someone who really wanted to go to Cambridge but didn't bother applying in the first instance, or who got rejected and is hoping to get in via the repechage.
What A-levels (or equivalent) and grades do you have?