Hi Jenny,

The podcasts for any HSK listening materials are free, but the tests themselves are premium content either as part of the regular transcripts or as part of our online test system.

http://popupchinese.com/tools/downloads

That said, we have an HSK App available on the iTunes App Store that has several thousand questions. If you can't afford a subscription you might want to check it out. The link is available on our page above for mobile tools: