What's CVEC ? What should I do ?

The CVEC fee is collected by the CROUS to promote the welcoming and social, health, cultural and sports support of all students. It's also collected to reinforce the actions of prevention and health education. It costs €100, and it's mandatory for all students.

CVEC's payment is one of the mandatory things for your registration in your University in France. 

You need to sign up here and then go right here to process the payment of that fee. 

Here is a French tutorial & here is an English tutorial on how to pay CVEC fee!