Any achievement, big or small. This is intended for you to have a confidence boost.
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So mine was today. I was really happy when 2 teachers gave me 100% in each assignment! Ik it's not that big of a deal, but it made me happy and feel good.
I'm not sure what my biggest one but recently I entered a music contest where you play a solo and get a rating. I got a 1 which is the highest score you can get.