Just found this through Google, so I won't take credit for it -- I think the guy who made this is "Hoc Phan," so kudos to him. But it was Freeware and I've found it very useful so far.
Basically each time I take a test, I copy-paste-rename a new tab and then do the test. While I've attached the original empty version for this post, I've found this copy-paste method a good way to keep track of my progress for different areas -- I've created one file for Verbal, one for Math, and so on. Haven't used any error logs yet, but the ones posted through the competition seem like a good way to tie everything in.
Not sure how the programming / coding works, but the timing feature has been extremely useful in getting myself disciplined when attacking problems. You can even specify the number of questions you want and the time will adjust itself based on either Math or Verbal. I can't be sure how accurate that is (or how to change it if it isn't), but better than the manual stopwatch I had previously.
Please feel free to illuminate if any of you have suggestions for improvements. Thanks.