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Legacy is a strange beast. Make sure you have Oracle access. Many venues have poor reception, so an app on your phone with offline access is ideal.

MTG Judge Core App for Android: https://play.google.com/store/apps/details?id=com.ndrue.gathereroffline&hl=en

MTG Guide for iOS http://www.mtgapps.com/mtg-guide/

Are you currently being mentored by another judge? L2 or higher judges have the ability to approve accounts on JudgeApps -- talk to your mentor, and they'll help you out with that.

If you don't have a mentor, it's a good idea to get into contact with one, as you'll need a L2 judge to administer your L1 exam and conduct your certification interview. Find a local L2. If you don't know any L2 judges in your area, contact your Regional Coordinator, and they can help you get in touch with one.

Does "double its power and toughness" function identically to "+X/+Y, where X is power and Y is toughness"? Or is doubling a different sublayer than adding?

The layer explanations don't explicitly indicate doubling as its own sublayer: https://magic.wizards.com/en/articles/archive/layer-system-2009-11-05

Here are the links for the FRF flyer - I can't find the DTK flyer for some reason, and am generating the ORI flyer tomorrow morning, but you get the idea:

Edit: New link.

Scenario: I play an Attune with Aether. While fetching a land I notice I have all 4 of my Glorybringers stacked on top of each other. I pull them out, and spread them throughout the deck in no particularly calculated order. I then do a pile shuffle, then a riffle shuffle, and I present my deck for cut.

Is this considered deck stacking?

Let me explain some rationale for why I think it is not deck stacking.

In Wizard's own Shuffling Dos & Don'ts they state that while mana weaving is deck stacking by itself, an adequate shuffle afterwards is just as random as not breaking up your cards beforehand.

I went to #mtgrules but could not get an effective discussion on this as the people on the IRC were not even willing to recognize that mana weaving then shuffling was legal (not that I do that anyway).

This is a good start :

https://jumpshare.com/v/Vkvn9N8UEKCnxtR6PUUc and http://wiki.magicjudges.org/en/w/L1_Exam_Resources

As a general idea I would be doing the easy practice questions and it will give you a good idea of what areas you might need to study better.

MY go to gotchas are: Layers (edit:Nothing too indepth as eluded to by Anusien), Phases and priorities, Casting a spell and Judging at Regular REL