Interesting idea, sefer.
I'm sure I have taken a few timed aptitude tests before that have involved assigning numbers to letters of the alphabet, and I always have to waste time counting them out with my fingers.
I always remember M is 13. I guess A, B, C and D are pretty easy to remember.
Even so, if you want a way to remeber A-1 (for completeness) you could note that A-1 is an expression meaning first class.
Looking at that list, you could perhaps find a link between Kicking-K (that's how I remembered K when I was learning to read) and Legs-11 (the Bingo call).
The G7 are a group of industrialized countries (not to be confused with the G8, who are the G7 plus Russia).
H8 is text speak for hate!
(I'm running out of ideas now.)
And if it's any help, I might also point out that some words are sort of symmetrical, such as WIZARD (W+D=I+R=Z+A=27) and BY (B+Y=27), as Martin Gardner once pointed out in Scientific American magazine.