You are correct in that Trinity does not just use points for UK students, unlike other Unis here. However, I don't understand it, its classed as a proportional weighting, no idea what it is. But places are held for international students, not EU students. You have the same status as an Irish student and treated as such. They get huge fees off internationals who also bump it up the rankings, proportion of internationals is one of the factors. If you can get over 500 points then relax, that's well above it. Every Irish student doing six out of 7 subjects at highe level has the potential to get 600 points. Those doing 3 a levels and using an as don't. It is far easier to get top grades in your system than ours though, it balances.