Beware of all theis 'AAB' 'BBC' *******s.
I got into my first degree (and my UCAS firm) uni with below their required grades. I came 3rd in my graduation year. Quite a few people who got onto the course with AAA didn't make it past the 1st year.
It's more about work ethic and how you cope than it is about the actual grades that you walked out of uni with. A-Levels to a degree are what GCSEs are to A-Levels - nothing....
Can you remember getting to A-Level and being told "what you learnt at GCSE was a simplification and not necessarily right, this is what you need to cite for A-Level". Well you'll get that again when you move to degree from A-Level. By the 2nd year of your degree, your A2s will mean nothing, and being a AAA student will not automatically get you a 1st at uni...