How do you get the extra xp without finishing the tech tree?

Mess Room
1

How do you get the extra xp without finishing the tech tree?

2

You get it from leftover say

You have 1k left on research gun but you got 20k in that match you keep 19k to use on anything

I hope you understand that cause idk how to put it

3

I understand. I wish we could switch to storing extra research.

4

Yea that would be nice tbh cause rn I just farm thing that I don’t need from like br2 or 3 since I play br4 (and yes I know I need to farm those anyway but come on I want to farm new stuff too)