I believe the schools will receive your scores from the last 5 years. But you shouldn't worry because almost every single school has a stated policy that they will take your top score. There are a few schools that will average your scores if you have more than 3, but since your other scores are much older, you might even be able to get them to forget about that. Some schools (Dartmouth I think) state that they will take your higher score from each section if you take the test several times.
So, don't worry about your old scores and do your best on your current test.
For practice, I would advise the Official Guide 11th edition, the GMATprep software that you can download from the official GMAT registration website, and the old paper tests, also available for purchase at the website.
I would strongly advise against using Kaplan