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I think it is a terrible mistake that the website has made, because there is no occasion when qu is pronounced tsʰu in Mandarin. Since you can actually tell the difference between u and ü, things should be easier for you now. You can just memorise that after (pinyin) j, q, x, y, ü is always written as u, and if you see u after j, q, x, y, it's always ...
There are a lot of grids available Hanzi Practice Sheets II and a free customizable one here Hanzi Practice Sheets. There is also Arch Chinese.
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