Create map from a form

Create map from a form

I need to create a map from a form, where I would like distinct records based on a field "Studente" and put as second value of map max value of field "Data"; example:

Studente       Data
Mario            26/10/2015
Alberto           6/2/2015
Giovanni       13/12/2015
Mario            2/8/2015
Alberto           6/11/2015
Mario            19/9/2015

I would obtain:

Studente        Data
Mario            26/10/2015
Giovanni       13/12/2015
Alberto           6/11/2015

Thanks