Hi, I think you'll make them for the subjects !, if you've just 6 subjects I think you can make this, but if you've table for subjects [unknow no. of subjects] this will not work.

As i know ... Every student is rolled in only 6 subjects no more... should i create 6 fileds for every student to count number of absences for every student in every subject ?

Hi, it'll work if you just neet to save the number of the absences, but what If you want to know the date of that absence ... I think you can make a new model for this ... If you're using Odoo V8 you can use the new buttons mechanism you can make 6 buttons in your student form view with the number of absences . You can check fleet module 'vehicle form view' you will find Costs, Contracts , Fuel ... with numbers