Experience can be obtained through these ways:
1. Players put in the formation can obtain experience after completing the matches in the career, leagues, Arena, and Champion League.
2. Experience cannot be obtained through cleared stages in career; however, you can rush the 3-star cleared stages to get EXP portion.
3. Matches with a Draw or Failure result in career can’t bring experience to players.
4. With more skills unlocked, the player’s level cap will increase accordingly.
5. Players with different quality have different level caps. For example, for A-player/S-player/SS-player/SSS-player with all skills unlocked, the level cap is 40/50/60/70. After the player reached level cap, he cannot gain any experience anymore.
If you would like to more about the exp, click on the "?" button shows on the player exp calculation page after a match, then you will see there are 7 rules related to the exp.