English Prepositions App Reviews

I thought this would be a smart game to exercise my english skills, but it is the same basic questions in each quiz rotated randomly, only about a dozen questions in total - I feel dumb. Should be a free app.

I am preparing to go to college this will help greatly! hope to see more english apps.

On my Mountain Lion Macbook, it opens a… black screen. No way to exit, not even Cmd-Q. Only after seconds reboot OSX offered to open w/o previously open apps, so I was able to regain access to my computer.