A visual memory test application gives some time to memorize images - numbers combinations, after that it shows a random shape and asks what the number is. What is to trick for such an application if your memory is not very good. Run The Visual Test
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Remembering a map of numbers to pictures requires your memory to map the numbers to shapes with any explanation you can think of i.e. in the above case say,
(+) -> 96.... (When I see 96, rotation leads to 96,so is for +).
JF-> 35.... (J looks like half 3 with lower part missing; F is 5 with lower part missing ).
KH ->15.... (H then I(1)...)
RED arrow -> 39 ( The arow's end looks like a 3 and RED(3)*3(arrow'send)=9) :P
It sounds ambiguous, but the logic of mapping is "to each his own".
Some simple ways:
a) Use math (a=1,b=2....z=26) to map shapes to numbers.
b) Use the picture's design ,make it synonymous to a number.
NOTE: It need not be a logical mapping, any random thoughts.
As far as I can think of, there are only two ways, you remember or you find someone/some tool who/which can remember.
That someone who can remember can be a screenshot (as suggested in comments by klm123) or another person who can sit beside you and tell you the answer.
Another solution is to find patterns if any and apply the same, but this is not an universal solution. As indicated by Emrakul these are subjective answers that I have used personally for other such similar situations (not tests)