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Sixty five words put A in the second box and D in the third. The fourth letter leans heavily on E and I, which between them cover thirty one of the group.
RADIO and RADAR sit at the top of this group by a wide margin. BADGE, CADET and LADEN each take a different fourth letter, so trying them as a set covers more ground than three similar words would.
Nine of the sixty five open with C. F, G and W tie behind it at six each, and after that the count drops into low single figures. With the first box still blank, C is the highest value test you have.
Seven words repeat the D in the fourth box, and DADDY, CADDY and PADDY all follow it with Y. That also explains why ten words in this group end in Y. Spotting a Y at the end makes the doubled D worth checking straight away.
Yes, and RADAR does the same thing. Both are palindromes, which is unusual at five letters and makes them easy to remember once you have met them.
Thirteen do. Most are the soft G shapes like BADGE, or the R plus E ending you get in PADRE and CADRE.
E and I together cover thirty one words, close to half the group. Everything else is spread thin, with D and G on seven each.