It depends on the university you wish to attend. At CCCU we require at least one A-Level in a 'numerate' subject (e.g. computer science, maths, physics).
Therefore, those look like a great combination to me!
I want to take Computer Science, Economics and Philosophy A-levels and want a career in IT. Would you consider them the right alevels?
I would take Mathematics- most degrees require that for computing. maybe drop philosophy- or if for some reson you really like philosophy drop economics instead.