Feature request: skip items likely mastered

[JackMostow]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is.
Time wasted on items already mastered

Describe the solution you'd like
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Skip items likely mastered

Describe alternatives you've considered
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Reordering matrix, but doesn't guarantee skipping learned items

Approach to be followed (optional)
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Trace performance at item level.

Additional context
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