In case you don't know, the first two numbers of the exam represent the year of the test (or so I've read).
I found the '05 one was similar in content to the October test. The older ones ('87) provide good calculus practice,
but don't accurately represent the full content of the newer tests.
In answer to your question though, it would be worthwhile to run through all of the questions because you'll want all the practice
you can get. Just keep the above in mind while doing so.