Sharepoint - Using CAML Builder Is it possible to query the items from multiple list in SharePoint 2013?

It is not possible using Caml query builder tool U2U.

you have to build your CAML Query as per below link : Using CAML Query to Retreive from Multiple Lists

you can use SpsiteDataQuery. Also you can try to use OOTB content query web part. From Link above

query.Lists = "<Lists><List ID='7A9FDBE6-0841-430a-8D9A-53355801B5D5' /><List 
ID='3D18F506-FCA1-451e-B645-2D720DC84FD8' /></Lists>";