How do you say tidy up in french?

The verb is "ranger". However, if this is referring to the command, it can either be simple or reflexive see the below examples:

Case 1: Ta chambre est complètement en désordre. Range-la! (Your room is a complete mess. Tidy it up!)

Case 2: Tu dois partir pour la fête dans une heure, range-toi! (You have to leave for the party in an hour, tidy yourself up!)