So, new versions of WordList are now on AppStore (they were approved last night). We have released 3 new versions:
SAT WordList
should primarily interest SAT test takers. It contains around 800 most frequently tested SAT words that may be prepared in a week or so.
GRE WordList
Just like SAT WordList, contains around 800 most frequently tested GRE words. Can be easily prepared in a week, should be of interest to GRE test takers.
WordList Pro
WordList pro contains 4000+ words arranged into 50 lists, may be used for any of the standardized tests. I am using it myself to improve my vocabulary 
Screenshots
So, here are some screenshots from the new versions (we made some minor tweaks to the UI so these are a little different than these)
List interface: easy/medium/hard buttons only appear if you have categorized some words in that particular list with that tag.
Word Screen
