I gained from 25 to 30 in 1:30 hour like this:
Spartan Ops Chapter 2
Mission 5 GAGARIN
My Setup for this:(tried many)
1 Play with Randoms (Find Game) ,(tried it alone, but only gives 3k XP)
2 Just try to get as much Kills at possible,(Im getting in average 50-65 Kills)
3 Watch your XP ranking up 
I get in average above 7k per game , so i think thats pretty fast.
How do you rank up fast?( I want to do a Completion Thread for this) 
Thats what ive been doing the the XP Cap system has been screwing with me.
LOL 7k? nice try. Max you can get for spartan ops is about 5.9k before double XP.
And it doesnât go by kills or deaths, just how long it takes you to finish. You can sit in a corner all match while your teammates finish the mission and still get 5.9k XP.
But yes, I would agree that spartan ops is the quickest way to rank up.
that level plus DOuble XP and getting over 35 kills will give you 11,900 EXP per 8-10 minutes.
> LOL 7k? nice try. Max you can get for spartan ops is about 5.9k before double XP.
>
> And it doesnât go by kills or deaths, just how long it takes you to finish. You can sit in a corner all match while your teammates finish the mission and still get 5.9k XP.
>
> But yes, I would agree that spartan ops is the quickest way to rank up.
I actually tested for beeing indle for 1 time but IT only gives 1400XP for the Full Mission
Also you get more XP for completing Commeditions âŚ
Again, itâs based off time. Your âtestâ of going idle resulted in 1400xp because your party didnât complete the mission close to the ideal time. If the mission is completed too fast or too slowly, you donât get the full 5.9k xp, no matter how much assistance you offered to the group.
with the double xp, i play the shootout at valhalla and i pull in 15,000 something every time so yeah but you should only play special ops if you have dbl.xp because thats the best way to use it.
Pioneer (fasttrack) on spartan ops, doing that i regularly got 9k+ without DBL EXP. Im SR130 now.
Why would you want to level up fast? Your rank means nothing and once you get to 130 itâs over. I almost wish there were .5 xp codes instead of double xp codes.
> Pioneer (fasttrack) on spartan ops, doing that i regularly got 9k+ without DBL EXP. Im SR130 now.
This is what I do when I feel motivated to rank up quickly. I prefer working on my Weapon Masteries though.
These are approximated numbers.
Legendary Spartan Ops - 7500
Double XP - 7500
Fast Track - 1000
Total - 16000
I found way not involving Spartan Ops or double XP.
First you have to find some noob to play with you on splitscreen as a guest. This way matchmaking will find you very weak opponents. Then go play Regicide and kill as many kings as possible. You will get some extra XP by being king yourself. All-in-all Regicide will give you at least twice as much XP as Slayer.
However whatâs the point? Faster you rank up, faster youâll stuck on 70 levelâŚ