is this the first time you're finding out you have a level of colour blindness - as it sounds that way... You can't be "bad" at colour blind tests like you fail a math test You either see it or you don't and there isn't to learn that makes you better at them.
Oh I've known about my colour blindness forever, but I was curious to see how many others see green.
Like with a computer monitor, normal colour vision in humans can understand 3 colours - red, green and blue. Red-green colour blindness means that your blue vision is intact but either red or green is missing, so that both red and green appear the same. I think that if you're seeing the op's pic as green, it means that your red vision has gone, so that it makes yellow appear as green to you.
<< normal 3-colour vision here and I see yellow.
I'm sure you're correct. It's weird though because I have no problem seeing red.