Sometimes I make a mistake on a test and it mentions I lost ranking on a test so I do the test again to get the skill as high as I can. Other times I make a mistake but all skills were unchanged, would taking the test again change anything? Increase a skill or energy points?

I wasn't sure which category this subject belong in so I placed it in general; feel free to move it if there's a more appropriate section for it.

Thank you kindly