I know a girl that got accepted into Yale's with an unweighted GPA of 4.1. She was doing IB though not A-Levels, I can ask for you how many IB subjects she had... IB is similar to A - Levels though. She participated in a lot of extra-curriculum activities but she only wrote down 5 on her application (maximum), she took part in a lot of non-academic activities (outside school).
I can ask specifically for you if needed.