Dear Student ,
To get the previous year question papers of SSC GD Constable , you can visit the official website of SSC which is ssc.nic.in . After then, you have to search for Answer Key tab to view the past year question's answer key. You can also get the questions through google search and some educational websites too.
Well, for more information .. you can go through this link:
Hope this helps !
Best wishes !!