Is it possible

To get an S on Thresh? Because after games like...

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1824080614/43282169?tab=overview

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1834202086/43282169?tab=overview

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1833275758/43282169?tab=overview

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1823749146/43282169?tab=overview

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1823003294/43282169?tab=overview

and only getting as high as A+ I'm really starting to have my doubts.