The best and the most effective way to level up is by playing 'free for all'
PROS: - Can give a lot of experience is you manage to come first
CONS:- Requires an internet connection, so cannot be played where wi-fi is not available (like in a car)
- It is usually difficult to come first, especially if you don't spend money on the game.
The next method is to play "Team VS"
PROS:- You play collectively as a team, so the chances of winning are higher and hence you get more experience
CONS:- Doesn't offer as much xp as free for all does
- It also requires an internet connection
Playing "missions mode"
PROS:- You can play it anywhere as long as you have battery to burn and time to kill
- It offers additional xp if you complete the tasks
- This mode is basically offline ffa, and coming first is a piece of cake
CONS:- Offers very little xp, but that can be supplemented by completing certain tasks
-Progressing becomes harder as you reach higher levels
Buying cash boosters double the xp you earn for a certain time period, and can prove to be very useful while levelling up. Do not use cash boosters while playing missions because missions provide very little xp and it's a waste using your boosts on missions mode. You can still play missions, but don't end the match. Only use cash boosters in free for all if you can come in the top 4. If not, then play team vs and try to win ffs.
The most economic option is the big experience booster, available for 100 gold, which doubles your experience earned. for 70 matches. Buying cash boosters needs gold which you probably don't have, so get this hack to get unlimited gold and cash:
Jailbroken:
Non-jailbroken: