By playing the FIFA Mobile Seasons program you can play in the real world leagues, earn points and get rewards such as season points, season medals, coins, skill boosts, common shards and player cards.
There are 10 divisions and a Legend Division in the Seasons. Each division has 3 to 5 leagues/tiers to play. The higher division you promote, the stronger leagues you face. You need to gain Seasons Points to progress in the current Season and collect Season Medals to complete Divisions. By completing a division you will receive a Season Player as division reward.
Each win has minimum 3 points. You can earn up to 5 points by meeting the division requirements which are usually having more than 6 players from that league in your starting 11.