Medical
lizplt,
Well done on passing selection! The first medical is a company medical, so in addition to checking that you'll be ok for a CAA medical, it's there to check you meet the company's standards too and pass the drug test.
After that, you'll be sent to the CAA at some point either before starting or while at the college - I've got a Class 1 (ATCO) medical, but I think I remember reading that ATCOs now/will soon only need a Class 2 (but don't hold me to that).
Hope that helps.