Alright, so I've done some more assessments with Posit Science:
Master Gardener: This measures my visual working memory processing speed. It was calculated to be 104 ms, with a goal set for 69 ms.
Road Tour: This measures my useful field of view (the field from which my brain can extract information). It was calculated to be 61 ms (don't ask why it's measured in ms; I have no idea), with a goal set for 18 ms. This corresponds to widening it by about 1.7 feet in terms of size.
High or Low?: I managed to distinguish 35 ms sweeps spaced 20 ms apart.
Tell us apart: I cleared doe/toe, nearly cleared bu/du and gah/dah, and started sah/stah
Match it!: This one is similar to tell us apart, but it's more like concentration. I managed to do this with 24 cards.