You can read the requirements here for the Model Check:
https://help.cgtrader.com/hc/en-us/articles/12602200107281-About-the-CGTrader-Quality-Standard
Model score doesn't really matter in my opinion but you can improve your model score by adding more formats, better descriptions, more tags etc. This is a good starting point:
https://help.cgtrader.com/hc/en-us/articles/360015139237-How-to-publish-3D-models-