The best advice for studying is
always,
"Don't leave it to the last minute!" But every year, there are a few people who come right up to Districts unprepared, facing an epic cram session before quizzes begin.
If you want to cram effectively, this article may be a big help.
You still have a little more than two weeks before Districts, so if you think you can organize your time to study, do so. But if not, a little cramming is a whole lot better than nothing.