It's really difficult to be honest. If you don't know what you want to do, I wouldn't reccomend going to Uni to get a degree.
IBM avoid recruiting graduates for the reason that they prefer to get them before Uni so they can train them for the job appropriately, as opposed to getting someone with a Geography degree who wants to do computer programming - It's utterly pointless.
NVQ Level 5 is good - they cover a wide range of skills that can be applied to many, many jobs, purely because it is more vocational.
If you want to become an astro-physicist, do physics, if you want to be a meteorological scientist, do geography or enviromental studies. But if you want a wide range of APPLICABLE skills, do an NVQ Level 5 in something.