All you need is 4 people. no certain gadgets or kits. You want to search for rush on operation locker, because its the smallest map and best to do this on. I find the searching for a server in the Asia region gives it a less chance of randoms joining. Also make sure its a ranked server! Join an empty server and invite your party, once in there will be two teams of two. One person from both the attacking and defending teams will go to both the A and B bombs. You will arm and defuse the bombs. It is rumored that if you don't wait 5 seconds between arming and defusing the bombs you could lose the XP. I have not had that problem but beware. There is a max number of times you can arm and defuse the bomb and get points from it. That number is 5. If you plant to bomb 5 times at A bomb, going to the B bomb still will not give you any XP. So one you have both armed and defused the bomb 5 times, let it blow up. Then move on to the next two bombs. There are 5 different bomb bases. one you've done all 5, the round will end and you will switch sides then repeat as the opposite team. You get 200 XP for arming the bomb everytime and 400 when it blows up, defenders get 400 XP for disarming it everytime. Make sure to also have the squad leader but an order on the bomb that the squad leader is not as so you both get extra points for following objective orders. You get about a minimum of 12kXP per round and can get over 100K with ribbons, challenges, boosts etc. The objective score show on the in-game leaderboards does go towards XP. And that XP goes towards your kit XP. so if your using the assault kit, it will level up your assault kit. So take that into mind to level your different kits. Hope this helps! If you have questions just ask and ill respond!