AArkley: please do! So your stage 2 in in Feb?! I was told they don't have any Stage 2's till May :S
Career Test: not sure, I presume it is used to stream between the En Route or Aerodrome controller course?
Sky Test Preparation Software: This is a program offered by a german company privately, (for $49 odd) and is designed to help people practice Stage 1 and 2 NATS tests.
Landing and Arithmatic Test: Well I'm not quire sure, but so far with NATS things have tended to be what they say on the tin, so I presuming it's like the "landing game" on the NATS careers website, mixed with some Arithmetic problems alongside. I have heard a similar thing exists in the FEAST test as run by eurocontrol.
NOTE: I have no experience of anything other than Stage 1 of NATS testing. So I may be talking rubbish... Can't say I didn't warn ya!
Phil