The EXP pass glitch and GP pass glitch are both easily doable but takes a hassle of a time.
The max GP and EXP you can get % in a game is
New Fireteam 50% event
20% exp and GP
Some of the passes no longer exist but they all once existed
All passes that are different can be used at once
Also a hint for the exp and gp glitch, think about tapping