It is easily possible to go to Grade 2 straight from the course (subject to how good you are of course), BUT (there's always a but) there are few things that everyone should be aware of when thinking about what jobs are available once you finish.
1) It depends on what jobs are AVAILABLE. Positions are not created especially for you. If there are no positions at your depot, then you may be displaced and moved, unless you fancy staying as the eternal third year apprentice.
2)You can apply for anything you feel qualified and experiencedd for. You may even be urged to take certain positions. You're not restricted.
3) Don't believe that you will be defaulted to a certain grade more senior than the basic. Just because you've completed the course, don't assume you can't get anything below Grade 2/Leading Trackman/whatever.
4) Money. Money varies all over the country. A Grade 2 in one part of the country may get paid more than a Grade 2 somewhere else. This stems back to the complicated local arrangements that can even stretch back to BR days. The fragmentation into IMC's during Railtrack didn't help either. The harmonisation of Maintenance into standard terms and conditions, and pay, is a very thorny issue for unions and management.
Before I'm seen to be painting a bleak picture, it's really not. The money is there if you work for it. Just don't expect it all in front of you when you finish, you may have to move, commute, or be patient. Your experience depends on how forward you are in years two and three in moving around all your depots departments, what skills you find yourself drawn to and are good at, and these determine how suitable a manager will find you for a role.
There are apprentices out there doing some fairly senior positions and for good money, and some will see the end of their days shovelling crap. Just try not to be the latter
To be honest, seeing the effort and keenness shown on this thread, I don't doubt that anyone here couldn't find themselves with a good job and having a chance to stretch their brains and make a difference.
that is some very sound advice you have given and its good to hear that as all the stuff you hear and read from NR doesnt seem to mention much after the apprenticeship
out of curiosity how big a jump did you make when you finished the apprenticeship
also am i correct to believe you work on the NMT?