You will open up far more options for yourself, particularly within engineering and the physical sciences, if you choose maths over biology.
However, if you prefer life sciences, then you would be better off dropping physics and picking up maths instead.
If you wish to keep the engineering, physical sciences and life sciences routes open, then you'll need to swap history for maths.
Assuming that you continue to want to take a degree in the sciences or engineering, you'll need to drop history after AS (or keep all four onto A2).