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Previous Tests

The following selection of tests are our previous contests. You may try these tests as many times as you like. At the end of the test, your results will be shown.

For video solutions to some questions, click here. The last video was uploaded Tuesday February 21st, 2017.

Start a Previous Test - English
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Start a Previous Test - Français
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Start a Previous Test - فارسی
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There have been 840,129 previous tests taken since September 3rd, 2009.