Maths, physics, chemistry, biology.
My school has switched to the new thing where you don't do AS levels and so they want most people to do three A-levels instead, because now if you take four and drop one after year 12 then you don't get any qualification for it (whereas before you'd get an AS).
They say that they're still letting some people do four if they think they can handle it, hopefully they will allow me to do four, if not I'll do maths physics chemistry.