Trying to Get S++ and 150 combos in resident evil mercenaries DLC

Resident Evil: The Mercenaries 3D is a third-person shooter video game developed by TOSE and published by Capcom for the Nintendo 3DS. It was released on June 2, 2011 in Japan, June 28, 2011 in North America, June 30, 2011 in Australia, and July 1, 2011 in Europe.
About myself:
I am Faiyaz Rayhan. I play video games for fun and memories. My goal is that 10 years from now, I will watch my old gaming videos and will laugh at how bad I used to play.