It is little bit difficult to get a seat in psg within general category but there are good colleges in which your son can get the admission. 

Hi Karthikeyan,

                      With general category its difficult to get any branch of engg in PSG with 113 marks.Still if luck permits you can wait till the last round and get branches like the metallurgical and materials engg,bio tech,production engg,biomedical,textile engg and fashion tech engg.But there is very less chances of that.

Hope this helped you.

Best of luck.