Here's a free to enter competition for bloggers. There are cash prizes, different age categories including those born before 2000, worldwide eligibility, the subject is education with specific questions to answer and you have until 13th October to enter. Those are the details I'm sure of.
I'm a bit hazy on the actual prize, it seems dependent on the number of entries. I'm also slightly unsure as to how people enter. As it's for bloggers, I'd gussed it would be via a blog post, but there's mention of entry forms and emailing submissions. Still, if you're keen to get your hands on up to $2,400, I'm sure you'll figure it out.