Shared XP is experience that comes from total team attack. Shared Xp can be good or bad, depending on the amount of attack that your team has racked up.

In order for someone to be eligible for shared xp, a player only needs 1 attk.

Shared Xp is the only xp you get from lvl 1 to about 50. From 50 - 75, it is a mix of xp you earn in battle and shard xp. After the switch from BB3 to BB4, it is mostly earned xp that you get from battles, and from there, shared Xp shows up minimally.

Shared basicaly means you get a % of the total dmg/exp for the room based on your ship/ship class. That changes if you win or lose. In GB dmg per team ranges from 400-900k sometimes more but not often. In blitz your getting a % of a much lower # due to ships having no soft defense and no DP(aka hp).

@BB2 you should be in GB hiding in the shadows then popping out and slamming someone with a salvo. Also you are a BB2 witch means you barely get any of the "shared" exp. Your a battleship witch means most of your EXP comes from personal damage. 

Also, the more damage you do to higher tier ships, the better exp you will get. Try to sneak to a BB3 and do some damage, if you have some good BB players on your team you can overwhelm a BB5 or 6 if you are lucky/really good. Try to do some damage above the 20k limit, that way you will get (With the event on) Around 20-30k per battle.

If you get lucky like I did in my KGV last night you can score a 200k+ game and get 150k+ exp lol

also try and stay till the end of the battle even if you are sunk and might win. But if looks like you might loose after you are dead then prolly best to leave and joint he next battle.