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How about a grid? You could freeze the latest test in a top row and then sort by date in the categories for latest vs. initial, latest vs. last? That would display the category results in each column below the latest. Depending on how many tests and how many categories, you could show this in one screen.
Since Jawn represents a significant change in both color and content, I would expect to go back to Moo. This opinion is also based on past experience with other search interfaces like Google. Within Google, if I perform a search under the default "All" category, then toggle from "All" to "Images", then click the back button, I am taken back to "All".
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