In the above video I show you where to find the best sniping spots on Interchange. Most of these spots are going to be outside the actual mall since it’s hard to get good range inside the mall. Here is a summary of the video and some of the best sniping spots for Escape From Tarkov Patch 12.2.
On top of the power station 
Ad tower outside of Idea 
Inside OLI by cash registers 
2nd floor over main entrance on beam 
2nd floor over main entrance on sand bags 
Rear of OLI stairs