as the periyar university does not a separate list of cutoffs or name of selected candidates so it would be very tough to get the admission results of 2016 mathematics . however you should talk to the college officials to know if there is any way or not . you can get the contact info from the college official website
Yes, you can join in other college during your second year of study. It is very easy if the both colleges come under the same University. But you can't do this in national institutes like IITs and central universities. All you need to have is good performance in your academics.
Hope it helps.