If you’re in China and learning Chinese, or even outside of China and need a benchmark of your Chinese ability then you’ll no doubt be taking the Hanyu Shuiping Kaoshi exam, or HSK 汉语水平考试（hàn yŭ shuǐ píng kǎo shì）. It’s not easy and you’ll need all the help you can get, which is why this next site will come in handy.
I heard about HSKFlashcards.com from the links section at MandarinSpot (a great site for Chinese text annotation), and they provide, unsurprisingly, flash cards for each of the HSK levels in various formats from PDF to PlecoDict, plain text and more. In addition to the HSK exam they also have the vocabulary lists for a various text books that are in common use for Chinese study, such as Practical Chinese Reader.
The flash cards really are a great resource, and while I’m not the biggest fan of flash cards overall, if you have a specific set of words to learn in a limited time, they can actually be useful. The only problem I could see if that the front and back of the flash card are printed on different sheets paper, meaning you’d have to cut them out and stick them together, rather than cutting and folding.
You can find the flashcards in the downloads section of HSKFlashcards.
Know of any other good online resources? Let us know!