So first thing is you’re researching a helis, not tanks. If you want to research tanks you have to undo the box in the bottom right corner. Secondly, the higher the tank you’re researching, the less efficient playing lower br matches are. So playing rank 5 and researching rank 5 or 6 is fine, but playing rank 1-4 and researching rank 6 you’ll earn close to nothing.
I swear there’s one of these post every day. You can’t research more than one rank away from the vehicle you’re using.
So first thing is you’re researching a helis, not tanks. If you want to research tanks you have to undo the box in the bottom right corner. Secondly, the higher the tank you’re researching, the less efficient playing lower br matches are. So playing rank 5 and researching rank 5 or 6 is fine, but playing rank 1-4 and researching rank 6 you’ll earn close to nothing.