One thing I don't like about the way missions are currently handled is that you cannot take a license test without aborting the current mission.
So either you should allow either multiple simultaneous missions or separate license tests from "real" missions.

P.S.
Maybe this has already been suggested, I just didn't want to dig my way through all the old threads... ;-)

I agree, maybe the licences could be issued as vender goods instead of as mission's, since all they seem to do is take credits from you, also i noticed if you need 2 licences you have to get them both at the same time, it happened to me earlier and I only had enough creds for one and so I couldn't do either, if they were trade items maybe that would solve it? Maybe have it as a trade good in you char info window where it show's you lvl's?

I believe this was done so that you can't keep leveling up at the easy missions indefinitely. There is however a way around it with group combat missions. Simply leave the group and ask to be reinvited. Granted yes a bot or two will be added to the list, but it's much better than having to end and start it all over every single time you level up.