Hey, MM

I've done Summer School three times because they were only available at that time: two were by correspondence, and one was on site (in Melbourne). It takes far less time than a normal semester's course, but costs up-front (depending on which uni you're going to) and still gets you the same number of credit-points as if you'd done it during the semester.

I was considering doing a third summer-school this (or next) year but the $$ stopped me, along with our private priorities. But if you have the time to put into it, and the money to pay for it, take the opportunity.