Healers who spent their time in Mists of Pandaria searching for that ever-elusive “triage” need not look any further than the newly-introduced Proving Grounds to get their frenzied healing fix.
Set in the Temple of the White Tiger, in Kun Lai Summit, the Proving Grounds solo scenario teams up healers with a group of NPCs to battle with waves of enemies equipped a variety of healer-targeted abilities.
To cap off the Bronze, Silver and Gold achievements, which you’ll need to complete in advance of putting this guide to good use, is the “Endless” trial, which is exactly what it sounds like—endless waves of mobs that get better at killing you with every wave.

If you and your NPC team manage to polish off 30 rounds of baddies, a new title, <the Proven Healer> will be yours, along with … this NEW CAR!!! Okay no, not really, this isn’t “The Price Is Right”. Sorry.

ANYWHO, to help lay the groundwork for Triage, The In-Game Experience, I put together some tips for you adventurous Resto Shaman out there, about builds, glyphs, best practices, and the waves themselves.
Hopefully you find it useful as you set about to prove that your raid team is easily replaced by a series of AI-driven processes, who are actually coded to stand in fire. (hehe) So enjoy! And if you have any specific questions that I haven’t addressed in the various sections of the post, hit me up in the comments, and I’ll do my best to help out.

For PG Endless, your focus is going to be entirely on getting the most amount of single-target healing on your group for the least amount of cost. Playing conservatively is going to be necessary because there will be some waves where you will not be able to avoid spending ½  - ¾ of your mana pool on that pull alone. So, your build is going to be the most mana conservative one out there:

• Tier 15: Stone Bulwark Totem. 1 GCD for a crapton of absorb healing. Also useful for getting a Bleed to fall off immediately.
  
• Tier 30: Completely open. I didn’t find any of these talents to be all that particularly useful. (Earthgrab will, unfortunately, not stop mobs from burrowing).
  
• Tier 45: Call of the Elements. Remember: mana conservation is the name of the game. More HST’s and SBT’s = better.
  
• Tier 60: Ancestral Swiftness, for the 1-minute instant-cast OR Echo of the Elements, because, free healing. (I went with AS on my first one, because I knew there would be a couple times where the tank would get beat down, and with no tank CD, Restos are a little bit at a loss).
  
• Tier 75: Rushing Streams. There’s no contest here.
  
• Tier 90: Unleashed Fury. Although I did use Primal Elementalist for one of my PG Endless run-throughs, using UF was actually much easier on my mana because it meant that I could power out an HS when a tank was getting trucked (read: Conqueror waves) or use UE+HW for a powerful but mana-conservative heal.
  

In terms of stats, I went with a high Spirit/Crit build, with a little more Mastery than I usually favor. I dropped as much Haste as I could, knowing that the speed of my heals wouldn’t be an issue.