Hello Daniela, the overall rating of the quizzes will serve to give from 0 to 4 points that will be added to a Report that we will do (we do not yet know how). The score of the report + the quiz points will be valid for 1/3 of the overall exam grade (1 Report : 1 written : 1 oral).
As for the multiple tenativives, an overall assessment will be made for the results, but also the commitment! there are no math averages. The attempts are multiple to make sure that we can learn better (Repetita iuvant!)