Fastest way to gain gp ?

So here i was just 15k away from buying another weapon and i thought that daily is boring to collect all that so i tried all the modes in the game -_-

TDM , SD , EM , FFA , GM are all good to get exp but bad to gp ( u get 300 gp and then you repair weapons with 257 )

Hm , MM , HMX gave me gp and didnt take gp to repair weapons and actually in HM u get most gp (if u get 20 kill in game u gonna get about 270-300 gp

SO i wanted to hear your opinion about that... with 4 Q &A

1- Which is the best mode to get gp ?
2- Do u think that repairing the weapons price is right or total rip off ?
3- The most gp u gained in a single game ?
4- is gp winning rate good or no ?

Tell me your opinions