Forget long lists of vocabulary. Unless you repeatedly use them, they go in one ear and out the other. Choose idioms you can repeat for different topics.
B1: https://www.facebook.com/groups/442986077128945
B2: https://www.facebook.com/groups/3929018337151517
C1 https://www.facebook.com/groups/235717371635565
C2 https://www.facebook.com/groups/1400521620283760
