T1 is the set of Dragonballs you get from the quest, where you can only wish for one single thing in the end.
T2 are gathered by a unfair event(every day for about 2 hours, if that time is when you sleep or work well then screw you, you don't get any) that are used for several wishes. Most importantly the transformation of your race and a buff.
T3 could only be gotten by beeing really really REALLY good in ranked PVP. But since i never was that i have no idea what you got from those.