To my wuwa survivors bros out there struggling with the 6/6 weapon combos thing, there are 2x combos for each character's starter weapon and you can check which combo you need in the gallery, just scroll down on the weapon tab. It's easiest to do on the final stage but the weapon upgrade choices are random so you won't always get what you need. When presented with a weapon choice, the left option will always be a combo weapon but if it's the wrong one just choose the right option and try again at the next choice, repeat 3x per run.
