MCH 2000
Don't worry too much about plane recognition - as long as you know rough speeds you'll be ok.
They usually show 3 planes, with speeds of about 120mph, 240mph and 400-450mph or there abouts and you have to say which order you will allow them to land. Take into account: distance from airfield, speed of aircraft + separation distances between aircraft (more turbulance from larger a/c).
Recommended book is the Laymans guide to ATC
which is quite useful.
Tracks across Atlantic info is in the booklet they send you, you don't need to know much more.
BTW I won't be seeing you in April, found out I didn't get through.
Will try again next year.
If you need anymore help though don't hestitate to ask and I'll see what I can do.