How can i prioritize tags are fired?
 

determines the order in which tags will be fired. Tag Firing Priority can be a positive or negative integer, and tags with higher priorities will be fired first. (For example, a priority 3 tag will fire before a priority 1 or 2 tag.) Priority defaults to 0 if none is specified.

Google Tag Manager's latest feature allows marketers and analysts to have even more control over their sites' data by prioritizing important Tags.