If you are considering going on to a do a Maths degree then you will almost certainly have to do further maths (if aiming for top 20/30).
They are good subjects for a Geography degree, but the workload of doing both Geography and History might be quite heavy (I don't do either so wait until someone else comes along to correct me.)
Again, to do a computer related degree then Maths is useful, but ICT will never be required for a top university course, they are more likely to want Maths or Physics.
They are a solid set, I would choose History over ICT though because ICT can be considered a soft subject, you can probably teach yourself the content of the A-level course and more by reading a few books if you know your way round a computer.
Any questions just ask, I've been a bit vague with my answers but let me know if you have any more :P