Bangalore University — 1. discrete mathematics 2. problem solving techniques using c

Sir/madam
I have backlog on my 1st sem and i again write that backlog subject in 3rd sem and again i fail my 1st sem backlog subject now i want to put my 1st sem paper to revaluation but when i go to bangalore university web site in revaluation link and select my 1st subject and calculated the amount there show it like date is expired /or not started please update my backlog to revaluation please solve this problem