Extra study is built in. It’s on your dashboard.
The self study quiz userscript is an addition (I’m a huge fan).
You can also launch self-study from other scripts. I highly recommend the following two:
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The item inspector
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The Ganbarometer (fair warning: I’m plugging my own script here.)
Since you’ve already been on the level for a while, both the “recent lessons” and “recent mistakes” queues in Extra Study should be helpful.