How I can recover the rank of the person answering in a quizz ?

@Liz - not sure if it is available BUT if you have a Welcome Screen in your form, you can show the Number of Submissions to date on the form. If that is available at load of the typeform, what would it take for the Product team to make that number available to capture as a variable and use logic rules to add 1 .. 

that may not give you the perfect number cuz someone else could also be doing the form at the same time but it would be ‘approximate’

if you connected to a Google sheet, for example, you can have a column that would store the ‘submission number’ ie a running total that is using a formula to add one to the value in the row above for each submission. (would need to put in place using arrayformula()...) 

you could then use something like Document Studio to generate and send the custom email out to the user with the field values in the body. And  you can attach a pdf report (would need to use a merge doc in either Docs or Slides to create) 

just thoughts

des