I have a few more questions (sorry and thanks tonnes btw):
1. Does rural entry apply for this
2. Which unis use GPA and which use ATAR
3. Do WSU and JMP use hurdles and UNSW, JCU and Bond use aggregate scores
4. What if your atar is sort of gross - do they use GPA in this case? Also do the "adjustment factors" even work anymore once you leave year 12?
5. How long are your atar results valid for / how many times can you attempt to get in using your atar
6. How long is your GPA valid for once you graduate with a bachelors degree?
7. Why do less people do this pathway as to the GAMSAMT one?
From your questions it seems you are a complete novice so let me start with this first.
-- There are 8 undergrad med schools JCU, JMP, WSU, UNSW, Monash, UTas, Adelaide, Curtin - undergrad means you don't necessarily need a Bach degree to start med and they don't use GAMSAT. All except JCU require UCAT.
-- There are a dozen or so graduate med schools requiring a Bach degree or higher to enter. All require you to sit GAMSAT, their selection criteria are various combinations of GPA + GAMSAT + Portfolio + Interview.
-- Of these grad schools six schools UQ, Griffith, USyd, UoM, Flinders, UWA make provisional offers to school leavers. Provisional in the sense graduate med but offers made *before* they even start a Bach degree.
Back to your questions:
1. Virtually all schools have a rural entry pathway, a few exceptions are the provisional offers from Griffith, USyd, UoM, Flinders.
2 to 4. Have a good read of this table especially the Weighting columns and Non-standard section, then come back if you still have questions
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[Undergrad] - (2019 Updated) Med schools Selection Criteria Y12s & Non-standards
5 & 6. Your ATAR & GPA are themselves for life. It's up to the individual unis/schools to specify their validity periods. See the Non-standard section above for undergrad schools, google GEMSAS Guide for grad schools (most only accept GPA less than 10yo).