If Oxford is the Uni you must go to, apply this year first, if failed
You could do A2 twice.
This is the tip, but that meant you would spend 3 years on A-level.
I want to change, but I do not know how to change!
PS: Does AAB have any chance to have interview in oxford?
I am not sure, just go for it.
The important more important thing is to show them you can get a result between AAA and AAAA.
Tell them your plan to achieve a result between AAA and AAAA.
You need to write that in your personal statement or the application form to OXFORD .
It is very important to listen to your teacher and ask your teacher to check your personal statement.