If you're not feeling confident about the aircraft it's worth making an effort- go through wikipedia for the long list in the first pack and make notes on what they are- twin engine long range widebody etc... There's lots of images and keep refelecting on the differences- Airbus and boeing use different winglets etc. There's a recognition quiz at
Airliners.net Aircraft Recognition Quiz but don't get too obsessed with it- find where your weaknesses are- you should know the differences between all the different boeings. If you just can't get differences between 737s and a320s then don't worry too much! You might get recognition questions, you might not (I didn't!) but it's worth being confident so that you don't stumble over any you get.
For the seven years- make sure you can explain why you've stuck at it and have good examples from it- teamwork etc, don't be negative about it. They will ask about this- they wanted to know why I'd done an English degree rather than something more science or theory based. Good luck!