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The API ammonia test is notoriously difficult to read. The best advice I can give is;
make sure you read the results under daylight, if at all possible, and avoid reading it under energy saving bulbs
take the top of the test tube off and look down it
hold the test tube a cm or so away from the card
the 'zero' result is greener than the yellow on the card.
As for the nitrate test; you really don't need to be that precise with it, it doesn't matter that much. Read it as;
yellow/pale orange = very good
orange = good
dark orange/red = bad
blood red = very bad