Don't give her the test. By giving her the test you are telling her "i can change", "i can be a better husband". And her response is going to be "its too late".
I hate to be blunt, but in all honesty she has a reason to be angry/indifferent towards you if you can't figure out what she needs. She probably has told you 100 times what she needs to feel loved. She just won't spell it out to you like "my love language is acts of service".
What does your wife complain about the most/what does your wife respond to the most?
What she complains about was the thing was what made it clear to me my wifes were Quality Time, and Acts of Service. Both of which i did not fill her tank for. I can still hear her saying "you never listen to me", and "i need you to get up with the girls at night"
I am doing my best to make this happen now, and honestly they are my 180s, but its late for me. I have seen the positives in my situation from it, but until my wifes A ends, i'm not sure there is any room for me in her heart.