If you, or more likely someone else you know, is studying for the SAT, I made a free app to help with the vocabulary section: SAT Vocab Master. It has 4971 words (more than any other free SAT app!) and lets you filter them based on part of speech, letter (ex. only those that start with E), or just the ones that you have marked for review. It has both flash card and multiple choice quiz mode, as well as a list of all words and common prefixes. The most recent feature added was the ability to receive study (push) notifications. I’ve been updating it ever 1-2 weeks for the last couple of months and plan on continuing to add features until it’s the best free vocabulary app in the Play store!